Removed `id_cache` from stats and cat apis.

Also removed the `id_cache` option from the clear cache api.

Closes #5269

docs/reference/cat/nodes.asciidoc

@@ -131,8 +131,6 @@ get operations |2
 gets |0s
 |`get.missing_total` |`gmto`, `getMissingTotal` |No |Number of failed
 get operations |1
-|`id_cache.memory_size` |`im`, `idCacheMemory` |No |Used ID cache
-memory |216b
 |`indexing.delete_current` |`idc`, `indexingDeleteCurrent` |No |Number
 of current deletion operations |0
 |`indexing.delete_time` |`idti`, `indexingDeleteTime` |No |Time spent in

docs/reference/cluster/stats.asciidoc

@@ -61,10 +61,6 @@ Will return, for example:
          "memory_size_in_bytes": 0,
          "evictions": 0
       },
-      "id_cache": {
-         "memory_size": "0b",
-         "memory_size_in_bytes": 0
-      },
       "completion": {
          "size": "0b",
          "size_in_bytes": 0

docs/reference/indices/clearcache.asciidoc

@@ -10,8 +10,7 @@ $ curl -XPOST 'http://localhost:9200/twitter/_cache/clear'
 --------------------------------------------------
 
 The API, by default, will clear all caches. Specific caches can be cleaned
-explicitly by setting `filter`, `fielddata`, `query_cache`,
-or `id_cache` to `true`.
+explicitly by setting `filter`, `fielddata` or `query_cache`.
 
 All caches relating to a specific field(s) can also be cleared by
 specifying `fields` parameter with a comma delimited list of the

docs/reference/migration/migrate_2_0.asciidoc

@@ -560,3 +560,29 @@ same search request will likely be off if `top_children` was used.
 
 === Removed file based index templates
 Index templates can no longer be configured on disk. Use the `_template` API instead.
+
+[float]
+=== Removed `id_cache` from stats apis
+
+Removed `id_cache` metric from nodes stats, indices stats and cluster stats apis. This metric has also been removed
+from the shards cat, indices cat and nodes cat apis. Parent/child memory is now reported under fielddata, because it
+has internally be using fielddata for a while now.
+
+To just see how much parent/child related field data is taking, the `fielddata_fields` option can be used on the stats
+apis. Indices stats example:
+
+[source,js]
+--------------------------------------------------
+curl -XGET "http://localhost:9200/_stats/fielddata?pretty&human&fielddata_fields=_parent"
+--------------------------------------------------
+
+Parent/child is using field data for the `_parent` field since version `1.1.0`, but the memory stats for the `_parent`
+field were still shown under `id_cache` metric in the stats apis for backwards compatible reasons between 1.x versions.
+
+Before version `1.1.0` the parent/child had its own in-memory data structures for id values in the `_parent` field.
+
+[float]
+=== Removed `id_cache` from clear cache api
+
+Removed `id_cache` option from the clear cache apis. The `fielddata` option should be used to clear `_parent` field
+from fielddata.

docs/reference/query-dsl/has-child-query.asciidoc

@@ -82,11 +82,11 @@ Additionally, every child document is mapped to its parent using a long
 value (approximately). It is advisable to keep the string parent ID short
 in order to reduce memory usage.
 
-You can check how much memory is being used by the ID cache using the
-<<indices-stats,indices stats>> or <<cluster-nodes-stats,nodes stats>>
+You can check how much memory is being used by the `_parent` field in the fielddata cache
+using the <<indices-stats,indices stats>> or <<cluster-nodes-stats,nodes stats>>
 APIS, eg:
 
 [source,js]
 --------------------------------------------------
-curl -XGET "http://localhost:9200/_stats/id_cache?pretty&human"
+curl -XGET "http://localhost:9200/_stats/fielddata?pretty&human&fielddata_fields=_parent"
 --------------------------------------------------

docs/reference/query-dsl/has-parent-query.asciidoc

@@ -57,13 +57,13 @@ Additionally, every child document is mapped to its parent using a long
 value (approximately). It is advisable to keep the string parent ID short
 in order to reduce memory usage.
 
-You can check how much memory is being used by the ID cache using the
-<<indices-stats,indices stats>> or <<cluster-nodes-stats,nodes stats>>
+You can check how much memory is being used by the `_parent` field in the fielddata cache
+using the <<indices-stats,indices stats>> or <<cluster-nodes-stats,nodes stats>>
 APIS, eg:
 
 [source,js]
 --------------------------------------------------
-curl -XGET "http://localhost:9200/_stats/id_cache?pretty&human"
+curl -XGET "http://localhost:9200/_stats/fielddata?pretty&human&fielddata_fields=_parent"
 --------------------------------------------------
 
 

rest-api-spec/api/indices.clear_cache.json

@@ -32,14 +32,6 @@
           "type" : "boolean",
           "description" : "Clear filter caches"
         },
-        "id": {
-          "type" : "boolean",
-          "description" : "Clear ID caches for parent/child"
-        },
-        "id_cache": {
-          "type" : "boolean",
-          "description" : "Clear ID caches for parent/child"
-        },
         "ignore_unavailable": {
             "type" : "boolean",
             "description" : "Whether specified concrete indices should be ignored when unavailable (missing or closed)"

rest-api-spec/api/indices.stats.json

@@ -17,7 +17,7 @@
         },
         "metric" : {
           "type" : "list",
-          "options" : ["_all", "completion", "docs", "fielddata", "filter_cache", "flush", "get", "id_cache", "indexing", "merge", "percolate", "query_cache", "refresh", "search", "segments", "store", "warmer", "suggest"],
+          "options" : ["_all", "completion", "docs", "fielddata", "filter_cache", "flush", "get", "indexing", "merge", "percolate", "query_cache", "refresh", "search", "segments", "store", "warmer", "suggest"],
           "description" : "Limit the information returned the specific metrics."
         }
       },

rest-api-spec/api/nodes.stats.json

@@ -20,7 +20,7 @@
         },
         "index_metric" : {
           "type" : "list",
-          "options" : ["_all", "completion", "docs", "fielddata", "filter_cache", "flush", "get", "id_cache", "indexing", "merge", "percolate", "query_cache", "refresh", "search", "segments", "store", "warmer", "suggest"],
+          "options" : ["_all", "completion", "docs", "fielddata", "filter_cache", "flush", "get", "indexing", "merge", "percolate", "query_cache", "refresh", "search", "segments", "store", "warmer", "suggest"],
           "description" : "Limit the information returned for `indices` metric to the specific index metrics. Isn't used if `indices` (or `all`) metric isn't specified."
         },
         "node_id": {

rest-api-spec/test/cat.shards/10_basic.yaml

@@ -29,7 +29,6 @@
                     get.exists_total                 .+   \n
                     get.missing_time                 .+   \n
                     get.missing_total                .+   \n
-                    id_cache.memory_size             .+   \n
                     indexing.delete_current          .+   \n
                     indexing.delete_time             .+   \n
                     indexing.delete_total            .+   \n

rest-api-spec/test/indices.stats/11_metric.yaml

@@ -30,7 +30,6 @@ setup:
   - is_true:  _all.total.flush
   - is_true:  _all.total.warmer
   - is_true:  _all.total.filter_cache
-  - is_true:  _all.total.id_cache
   - is_true:  _all.total.fielddata
   - is_true:  _all.total.percolate
   - is_true:  _all.total.completion
@@ -54,7 +53,6 @@ setup:
   - is_true:  _all.total.flush
   - is_true:  _all.total.warmer
   - is_true:  _all.total.filter_cache
-  - is_true:  _all.total.id_cache
   - is_true:  _all.total.fielddata
   - is_true:  _all.total.percolate
   - is_true:  _all.total.completion
@@ -78,7 +76,6 @@ setup:
   - is_false:  _all.total.flush
   - is_false:  _all.total.warmer
   - is_false:  _all.total.filter_cache
-  - is_false:  _all.total.id_cache
   - is_false:  _all.total.fielddata
   - is_false:  _all.total.percolate
   - is_false:  _all.total.completion
@@ -102,7 +99,6 @@ setup:
   - is_false:  _all.total.flush
   - is_false:  _all.total.warmer
   - is_false:  _all.total.filter_cache
-  - is_false:  _all.total.id_cache
   - is_false:  _all.total.fielddata
   - is_false:  _all.total.percolate
   - is_false:  _all.total.completion
@@ -127,7 +123,6 @@ setup:
   - is_false:  _all.total.flush
   - is_false:  _all.total.warmer
   - is_false:  _all.total.filter_cache
-  - is_false:  _all.total.id_cache
   - is_false:  _all.total.fielddata
   - is_false:  _all.total.percolate
   - is_false:  _all.total.completion

src/main/java/org/elasticsearch/action/admin/cluster/stats/ClusterStatsIndices.java

@@ -30,7 +30,6 @@ import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentBuilderString;
 import org.elasticsearch.index.cache.filter.FilterCacheStats;
-import org.elasticsearch.index.cache.id.IdCacheStats;
 import org.elasticsearch.index.engine.SegmentsStats;
 import org.elasticsearch.index.fielddata.FieldDataStats;
 import org.elasticsearch.index.percolator.stats.PercolateStats;
@@ -48,7 +47,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
     private StoreStats store;
     private FieldDataStats fieldData;
     private FilterCacheStats filterCache;
-    private IdCacheStats idCache;
     private CompletionStats completion;
     private SegmentsStats segments;
     private PercolateStats percolate;
@@ -63,7 +61,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
         this.store = new StoreStats();
         this.fieldData = new FieldDataStats();
         this.filterCache = new FilterCacheStats();
-        this.idCache = new IdCacheStats();
         this.completion = new CompletionStats();
         this.segments = new SegmentsStats();
         this.percolate = new PercolateStats();
@@ -87,7 +84,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
                 store.add(shardCommonStats.store);
                 fieldData.add(shardCommonStats.fieldData);
                 filterCache.add(shardCommonStats.filterCache);
-                idCache.add(shardCommonStats.idCache);
                 completion.add(shardCommonStats.completion);
                 segments.add(shardCommonStats.segments);
                 percolate.add(shardCommonStats.percolate);
@@ -125,10 +121,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
         return filterCache;
     }
 
-    public IdCacheStats getIdCache() {
-        return idCache;
-    }
-
     public CompletionStats getCompletion() {
         return completion;
     }
@@ -149,7 +141,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
         store = StoreStats.readStoreStats(in);
         fieldData = FieldDataStats.readFieldDataStats(in);
         filterCache = FilterCacheStats.readFilterCacheStats(in);
-        idCache = IdCacheStats.readIdCacheStats(in);
         completion = CompletionStats.readCompletionStats(in);
         segments = SegmentsStats.readSegmentsStats(in);
         percolate = PercolateStats.readPercolateStats(in);
@@ -163,7 +154,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
         store.writeTo(out);
         fieldData.writeTo(out);
         filterCache.writeTo(out);
-        idCache.writeTo(out);
         completion.writeTo(out);
         segments.writeTo(out);
         percolate.writeTo(out);
@@ -187,7 +177,6 @@ public class ClusterStatsIndices implements ToXContent, Streamable {
         store.toXContent(builder, params);
         fieldData.toXContent(builder, params);
         filterCache.toXContent(builder, params);
-        idCache.toXContent(builder, params);
         completion.toXContent(builder, params);
         segments.toXContent(builder, params);
         percolate.toXContent(builder, params);

src/main/java/org/elasticsearch/action/admin/cluster/stats/TransportClusterStatsAction.java

@@ -56,8 +56,8 @@ public class TransportClusterStatsAction extends TransportNodesOperationAction<C
         TransportClusterStatsAction.ClusterStatsNodeRequest, ClusterStatsNodeResponse> {
 
     private static final CommonStatsFlags SHARD_STATS_FLAGS = new CommonStatsFlags(CommonStatsFlags.Flag.Docs, CommonStatsFlags.Flag.Store,
-            CommonStatsFlags.Flag.FieldData, CommonStatsFlags.Flag.FilterCache, CommonStatsFlags.Flag.IdCache,
-            CommonStatsFlags.Flag.Completion, CommonStatsFlags.Flag.Segments, CommonStatsFlags.Flag.Percolate);
+            CommonStatsFlags.Flag.FieldData, CommonStatsFlags.Flag.FilterCache, CommonStatsFlags.Flag.Completion, CommonStatsFlags.Flag.Segments,
+            CommonStatsFlags.Flag.Percolate);
 
     private final NodeService nodeService;
     private final IndicesService indicesService;

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/ClearIndicesCacheRequest.java

@@ -33,7 +33,6 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
 
     private boolean filterCache = false;
     private boolean fieldDataCache = false;
-    private boolean idCache = false;
     private boolean recycler = false;
     private boolean queryCache = false;
     private String[] fields = null;
@@ -82,10 +81,6 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
         return this.fields;
     }
 
-    public boolean idCache() {
-        return this.idCache;
-    }
-    
     public ClearIndicesCacheRequest recycler(boolean recycler) {
         this.recycler = recycler;
         return this;
@@ -95,17 +90,11 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
         return this.recycler;
     }
 
-    public ClearIndicesCacheRequest idCache(boolean idCache) {
-        this.idCache = idCache;
-        return this;
-    }
-
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
         filterCache = in.readBoolean();
         fieldDataCache = in.readBoolean();
-        idCache = in.readBoolean();
         recycler = in.readBoolean();
         fields = in.readStringArray();
         queryCache = in.readBoolean();
@@ -116,7 +105,6 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
         super.writeTo(out);
         out.writeBoolean(filterCache);
         out.writeBoolean(fieldDataCache);
-        out.writeBoolean(idCache);
         out.writeBoolean(recycler);
         out.writeStringArrayNullable(fields);
         out.writeBoolean(queryCache);

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/ClearIndicesCacheRequestBuilder.java

@@ -51,8 +51,4 @@ public class ClearIndicesCacheRequestBuilder extends BroadcastOperationRequestBu
         return this;
     }
 
-    public ClearIndicesCacheRequestBuilder setIdCache(boolean idCache) {
-        request.idCache(idCache);
-        return this;
-    }
 }

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/ShardClearIndicesCacheRequest.java

@@ -34,7 +34,6 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
 
     private boolean filterCache = false;
     private boolean fieldDataCache = false;
-    private boolean idCache = false;
     private boolean recycler;
     private boolean queryCache = false;
 
@@ -47,7 +46,6 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         super(shardId, request);
         filterCache = request.filterCache();
         fieldDataCache = request.fieldDataCache();
-        idCache = request.idCache();
         fields = request.fields();
         recycler = request.recycler();
         queryCache = request.queryCache();
@@ -65,10 +63,6 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         return this.fieldDataCache;
     }
 
-    public boolean idCache() {
-        return this.idCache;
-    }
-    
     public boolean recycler() {
         return this.recycler;
     }
@@ -77,17 +71,11 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         return this.fields;
     }
 
-    public ShardClearIndicesCacheRequest waitForOperations(boolean waitForOperations) {
-        this.filterCache = waitForOperations;
-        return this;
-    }
-
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
         filterCache = in.readBoolean();
         fieldDataCache = in.readBoolean();
-        idCache = in.readBoolean();
         recycler = in.readBoolean();
         fields = in.readStringArray();
         queryCache = in.readBoolean();
@@ -98,7 +86,6 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         super.writeTo(out);
         out.writeBoolean(filterCache);
         out.writeBoolean(fieldDataCache);
-        out.writeBoolean(idCache);
         out.writeBoolean(recycler);
         out.writeStringArrayNullable(fields);
         out.writeBoolean(queryCache);

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/TransportClearIndicesCacheAction.java

@@ -125,10 +125,6 @@ public class TransportClearIndicesCacheAction extends TransportBroadcastOperatio
                 clearedAtLeastOne = true;
                 // cacheRecycler.clear();
             }
-            if (request.idCache()) {
-                clearedAtLeastOne = true;
-                service.fieldData().clearField(ParentFieldMapper.NAME);
-            }
             if (!clearedAtLeastOne) {
                 if (request.fields() != null && request.fields().length > 0) {
                     // only clear caches relating to the specified fields

src/main/java/org/elasticsearch/action/admin/indices/stats/CommonStats.java

@@ -27,7 +27,6 @@ import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.index.cache.filter.FilterCacheStats;
-import org.elasticsearch.index.cache.id.IdCacheStats;
 import org.elasticsearch.index.cache.query.QueryCacheStats;
 import org.elasticsearch.index.engine.SegmentsStats;
 import org.elasticsearch.index.fielddata.FieldDataStats;
@@ -92,9 +91,6 @@ public class CommonStats implements Streamable, ToXContent {
                 case FilterCache:
                     filterCache = new FilterCacheStats();
                     break;
-                case IdCache:
-                    idCache = new IdCacheStats();
-                    break;
                 case FieldData:
                     fieldData = new FieldDataStats();
                     break;
@@ -161,9 +157,6 @@ public class CommonStats implements Streamable, ToXContent {
                 case FilterCache:
                     filterCache = indexShard.filterCacheStats();
                     break;
-                case IdCache:
-                    idCache = indexShard.idCacheStats();
-                    break;
                 case FieldData:
                     fieldData = indexShard.fieldDataStats(flags.fieldDataFields());
                     break;
@@ -224,9 +217,6 @@ public class CommonStats implements Streamable, ToXContent {
     @Nullable
     public FilterCacheStats filterCache;
 
-    @Nullable
-    public IdCacheStats idCache;
-
     @Nullable
     public FieldDataStats fieldData;
 
@@ -333,15 +323,6 @@ public class CommonStats implements Streamable, ToXContent {
             filterCache.add(stats.getFilterCache());
         }
 
-        if (idCache == null) {
-            if (stats.getIdCache() != null) {
-                idCache = new IdCacheStats();
-                idCache.add(stats.getIdCache());
-            }
-        } else {
-            idCache.add(stats.getIdCache());
-        }
-
         if (fieldData == null) {
             if (stats.getFieldData() != null) {
                 fieldData = new FieldDataStats();
@@ -458,11 +439,6 @@ public class CommonStats implements Streamable, ToXContent {
         return this.filterCache;
     }
 
-    @Nullable
-    public IdCacheStats getIdCache() {
-        return this.idCache;
-    }
-
     @Nullable
     public FieldDataStats getFieldData() {
         return this.fieldData;
@@ -511,7 +487,7 @@ public class CommonStats implements Streamable, ToXContent {
 
     /**
      * Utility method which computes total memory by adding
-     * FieldData, IdCache, Percolate, Segments (memory, index writer, version map)
+     * FieldData, Percolate, Segments (memory, index writer, version map)
      */
     public ByteSizeValue getTotalMemory() {
         long size = 0;
@@ -521,9 +497,6 @@ public class CommonStats implements Streamable, ToXContent {
         if (this.getFilterCache() != null) {
             size += this.getFilterCache().getMemorySizeInBytes();
         }
-        if (this.getIdCache() != null) {
-            size += this.getIdCache().getMemorySizeInBytes();
-        }
         if (this.getPercolate() != null) {
             size += this.getPercolate().getMemorySizeInBytes();
         }
@@ -568,9 +541,6 @@ public class CommonStats implements Streamable, ToXContent {
         if (in.readBoolean()) {
             filterCache = FilterCacheStats.readFilterCacheStats(in);
         }
-        if (in.readBoolean()) {
-            idCache = IdCacheStats.readIdCacheStats(in);
-        }
         if (in.readBoolean()) {
             fieldData = FieldDataStats.readFieldDataStats(in);
         }
@@ -651,12 +621,6 @@ public class CommonStats implements Streamable, ToXContent {
             out.writeBoolean(true);
             filterCache.writeTo(out);
         }
-        if (idCache == null) {
-            out.writeBoolean(false);
-        } else {
-            out.writeBoolean(true);
-            idCache.writeTo(out);
-        }
         if (fieldData == null) {
             out.writeBoolean(false);
         } else {
@@ -720,9 +684,6 @@ public class CommonStats implements Streamable, ToXContent {
         if (filterCache != null) {
             filterCache.toXContent(builder, params);
         }
-        if (idCache != null) {
-            idCache.toXContent(builder, params);
-        }
         if (fieldData != null) {
             fieldData.toXContent(builder, params);
         }

src/main/java/org/elasticsearch/action/admin/indices/stats/CommonStatsFlags.java

@@ -216,7 +216,6 @@ public class CommonStatsFlags implements Streamable, Cloneable {
         Flush("flush"),
         Refresh("refresh"),
         FilterCache("filter_cache"),
-        IdCache("id_cache"),
         FieldData("fielddata"),
         Docs("docs"),
         Warmer("warmer"),

src/main/java/org/elasticsearch/action/admin/indices/stats/IndicesStatsRequest.java

@@ -175,15 +175,6 @@ public class IndicesStatsRequest extends BroadcastOperationRequest<IndicesStatsR
         return flags.isSet(Flag.FilterCache);
     }
 
-    public IndicesStatsRequest idCache(boolean idCache) {
-        flags.set(Flag.IdCache, idCache);
-        return this;
-    }
-
-    public boolean idCache() {
-        return flags.isSet(Flag.IdCache);
-    }
-
     public IndicesStatsRequest fieldData(boolean fieldData) {
         flags.set(Flag.FieldData, fieldData);
         return this;

src/main/java/org/elasticsearch/action/admin/indices/stats/IndicesStatsRequestBuilder.java

@@ -117,11 +117,6 @@ public class IndicesStatsRequestBuilder extends BroadcastOperationRequestBuilder
         return this;
     }
 
-    public IndicesStatsRequestBuilder setIdCache(boolean idCache) {
-        request.idCache(idCache);
-        return this;
-    }
-
     public IndicesStatsRequestBuilder setFieldData(boolean fieldData) {
         request.fieldData(fieldData);
         return this;

src/main/java/org/elasticsearch/action/admin/indices/stats/TransportIndicesStatsAction.java

@@ -161,9 +161,6 @@ public class TransportIndicesStatsAction extends TransportBroadcastOperationActi
         if (request.request.filterCache()) {
             flags.set(CommonStatsFlags.Flag.FilterCache);
         }
-        if (request.request.idCache()) {
-            flags.set(CommonStatsFlags.Flag.IdCache);
-        }
         if (request.request.fieldData()) {
             flags.set(CommonStatsFlags.Flag.FieldData);
             flags.fieldDataFields(request.request.fieldDataFields());

src/main/java/org/elasticsearch/index/cache/id/IdCacheStats.java

@@ -1,89 +0,0 @@
-/*
- * Licensed to Elasticsearch under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package org.elasticsearch.index.cache.id;
-
-import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.io.stream.Streamable;
-import org.elasticsearch.common.unit.ByteSizeValue;
-import org.elasticsearch.common.xcontent.ToXContent;
-import org.elasticsearch.common.xcontent.XContentBuilder;
-import org.elasticsearch.common.xcontent.XContentBuilderString;
-
-import java.io.IOException;
-
-/**
- * @deprecated Id cache has been removed in favor for {@link org.elasticsearch.index.fielddata.plain.ParentChildIndexFieldData}
- * this class now reports field data memory usage for _parent field.
- */
-@Deprecated
-public class IdCacheStats implements Streamable, ToXContent {
-
-    long memorySize;
-
-    public IdCacheStats() {
-    }
-
-    public IdCacheStats(long memorySize) {
-        this.memorySize = memorySize;
-    }
-
-    public void add(IdCacheStats stats) {
-        this.memorySize += stats.memorySize;
-    }
-
-    public long getMemorySizeInBytes() {
-        return this.memorySize;
-    }
-
-    public ByteSizeValue getMemorySize() {
-        return new ByteSizeValue(memorySize);
-    }
-
-    public static IdCacheStats readIdCacheStats(StreamInput in) throws IOException {
-        IdCacheStats stats = new IdCacheStats();
-        stats.readFrom(in);
-        return stats;
-    }
-
-    @Override
-    public void readFrom(StreamInput in) throws IOException {
-        memorySize = in.readVLong();
-    }
-
-    @Override
-    public void writeTo(StreamOutput out) throws IOException {
-        out.writeVLong(memorySize);
-    }
-
-    @Override
-    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
-        builder.startObject(Fields.ID_CACHE);
-        builder.byteSizeField(Fields.MEMORY_SIZE_IN_BYTES, Fields.MEMORY_SIZE, memorySize);
-        builder.endObject();
-        return builder;
-    }
-
-    static final class Fields {
-        static final XContentBuilderString ID_CACHE = new XContentBuilderString("id_cache");
-        static final XContentBuilderString MEMORY_SIZE = new XContentBuilderString("memory_size");
-        static final XContentBuilderString MEMORY_SIZE_IN_BYTES = new XContentBuilderString("memory_size_in_bytes");
-    }
-}

src/main/java/org/elasticsearch/index/fielddata/ShardFieldData.java

@@ -59,14 +59,7 @@ public class ShardFieldData extends AbstractIndexShardComponent implements Index
                 }
             }
         }
-
-        // Because we report _parent field used memory separately via id cache, we need to subtract it from the
-        // field data total memory used. This code should be removed for >= 2.0
-        long memorySize = totalMetric.count();
-        if (perFieldTotals.containsKey(ParentFieldMapper.NAME)) {
-            memorySize -= perFieldTotals.get(ParentFieldMapper.NAME).count();
-        }
-        return new FieldDataStats(memorySize, evictionsMetric.count(), fieldTotals);
+        return new FieldDataStats(totalMetric.count(), evictionsMetric.count(), fieldTotals);
     }
 
     @Override

src/main/java/org/elasticsearch/index/shard/IndexShard.java

@@ -65,7 +65,6 @@ import org.elasticsearch.index.cache.IndexCache;
 import org.elasticsearch.index.cache.bitset.ShardBitsetFilterCache;
 import org.elasticsearch.index.cache.filter.FilterCacheStats;
 import org.elasticsearch.index.cache.filter.ShardFilterCache;
-import org.elasticsearch.index.cache.id.IdCacheStats;
 import org.elasticsearch.index.cache.query.ShardQueryCache;
 import org.elasticsearch.index.codec.CodecService;
 import org.elasticsearch.index.deletionpolicy.SnapshotDeletionPolicy;
@@ -665,11 +664,6 @@ public class IndexShard extends AbstractIndexShardComponent {
         return shardPercolateService;
     }
 
-    public IdCacheStats idCacheStats() {
-        long memorySizeInBytes = shardFieldData.stats(ParentFieldMapper.NAME).getFields().get(ParentFieldMapper.NAME);
-        return new IdCacheStats(memorySizeInBytes);
-    }
-
     public TranslogStats translogStats() {
         return engine().getTranslog().stats();
     }

src/main/java/org/elasticsearch/indices/NodeIndicesStats.java

@@ -34,7 +34,6 @@ import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentBuilderString;
 import org.elasticsearch.index.Index;
 import org.elasticsearch.index.cache.filter.FilterCacheStats;
-import org.elasticsearch.index.cache.id.IdCacheStats;
 import org.elasticsearch.index.cache.query.QueryCacheStats;
 import org.elasticsearch.index.engine.SegmentsStats;
 import org.elasticsearch.index.fielddata.FieldDataStats;
@@ -142,11 +141,6 @@ public class NodeIndicesStats implements Streamable, Serializable, ToXContent {
         return stats.getQueryCache();
     }
 
-    @Nullable
-    public IdCacheStats getIdCache() {
-        return stats.getIdCache();
-    }
-
     @Nullable
     public CompletionStats getCompletion() {
         return stats.getCompletion();

src/main/java/org/elasticsearch/rest/action/admin/indices/cache/clear/RestClearIndicesCacheAction.java

@@ -79,9 +79,6 @@ public class RestClearIndicesCacheAction extends BaseRestHandler {
             if (Fields.FIELD_DATA.match(entry.getKey())) {
                 clearIndicesCacheRequest.fieldDataCache(request.paramAsBoolean(entry.getKey(), clearIndicesCacheRequest.fieldDataCache()));
             }
-            if (Fields.ID.match(entry.getKey())) {
-                clearIndicesCacheRequest.idCache(request.paramAsBoolean(entry.getKey(), clearIndicesCacheRequest.idCache()));
-            }
             if (Fields.RECYCLER.match(entry.getKey())) {
                 clearIndicesCacheRequest.recycler(request.paramAsBoolean(entry.getKey(), clearIndicesCacheRequest.recycler()));
             }
@@ -96,7 +93,6 @@ public class RestClearIndicesCacheAction extends BaseRestHandler {
     public static class Fields {
         public static final ParseField FILTER = new ParseField("filter", "filter_cache");
         public static final ParseField FIELD_DATA = new ParseField("field_data", "fielddata");
-        public static final ParseField ID = new ParseField("id", "id_cache");
         public static final ParseField RECYCLER = new ParseField("recycler");
         public static final ParseField FIELDS = new ParseField("fields");
     }

src/main/java/org/elasticsearch/rest/action/admin/indices/stats/RestIndicesStatsAction.java

@@ -73,7 +73,6 @@ public class RestIndicesStatsAction extends BaseRestHandler {
             indicesStatsRequest.flush(metrics.contains("flush"));
             indicesStatsRequest.warmer(metrics.contains("warmer"));
             indicesStatsRequest.filterCache(metrics.contains("filter_cache"));
-            indicesStatsRequest.idCache(metrics.contains("id_cache"));
             indicesStatsRequest.percolate(metrics.contains("percolate"));
             indicesStatsRequest.segments(metrics.contains("segments"));
             indicesStatsRequest.fieldData(metrics.contains("fielddata"));

src/main/java/org/elasticsearch/rest/action/cat/RestIndicesAction.java

@@ -163,9 +163,6 @@ public class RestIndicesAction extends AbstractCatAction {
         table.addCell("get.missing_total", "sibling:pri;alias:gmto,getMissingTotal;default:false;text-align:right;desc:number of failed gets");
         table.addCell("pri.get.missing_total", "default:false;text-align:right;desc:number of failed gets");
 
-        table.addCell("id_cache.memory_size", "sibling:pri;alias:im,idCacheMemory;default:false;text-align:right;desc:used id cache");
-        table.addCell("pri.id_cache.memory_size", "default:false;text-align:right;desc:used id cache");
-
         table.addCell("indexing.delete_current", "sibling:pri;alias:idc,indexingDeleteCurrent;default:false;text-align:right;desc:number of current deletions");
         table.addCell("pri.indexing.delete_current", "default:false;text-align:right;desc:number of current deletions");
 
@@ -365,9 +362,6 @@ public class RestIndicesAction extends AbstractCatAction {
             table.addCell(indexStats == null ? null : indexStats.getTotal().getGet().getMissingCount());
             table.addCell(indexStats == null ? null : indexStats.getPrimaries().getGet().getMissingCount());
 
-            table.addCell(indexStats == null ? null : indexStats.getTotal().getIdCache().getMemorySize());
-            table.addCell(indexStats == null ? null : indexStats.getPrimaries().getIdCache().getMemorySize());
-
             table.addCell(indexStats == null ? null : indexStats.getTotal().getIndexing().getTotal().getDeleteCurrent());
             table.addCell(indexStats == null ? null : indexStats.getPrimaries().getIndexing().getTotal().getDeleteCurrent());
 

src/main/java/org/elasticsearch/rest/action/cat/RestNodesAction.java

@@ -36,7 +36,6 @@ import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.InetSocketTransportAddress;
 import org.elasticsearch.index.cache.filter.FilterCacheStats;
-import org.elasticsearch.index.cache.id.IdCacheStats;
 import org.elasticsearch.index.cache.query.QueryCacheStats;
 import org.elasticsearch.index.engine.SegmentsStats;
 import org.elasticsearch.index.fielddata.FieldDataStats;
@@ -162,8 +161,6 @@ public class RestNodesAction extends AbstractCatAction {
         table.addCell("get.missing_time", "alias:gmti,getMissingTime;default:false;text-align:right;desc:time spent in failed gets");
         table.addCell("get.missing_total", "alias:gmto,getMissingTotal;default:false;text-align:right;desc:number of failed gets");
 
-        table.addCell("id_cache.memory_size", "alias:im,idCacheMemory;default:false;text-align:right;desc:used id cache");
-
         table.addCell("indexing.delete_current", "alias:idc,indexingDeleteCurrent;default:false;text-align:right;desc:number of current deletions");
         table.addCell("indexing.delete_time", "alias:idti,indexingDeleteTime;default:false;text-align:right;desc:time spent in deletions");
         table.addCell("indexing.delete_total", "alias:idto,indexingDeleteTotal;default:false;text-align:right;desc:number of delete ops");
@@ -295,9 +292,6 @@ public class RestNodesAction extends AbstractCatAction {
             table.addCell(getStats == null ? null : getStats.getMissingTime());
             table.addCell(getStats == null ? null : getStats.getMissingCount());
 
-            IdCacheStats idCacheStats = indicesStats == null ? null : indicesStats.getIdCache();
-            table.addCell(idCacheStats == null ? null : idCacheStats.getMemorySize());
-
             IndexingStats indexingStats = indicesStats == null ? null : indicesStats.getIndexing();
             table.addCell(indexingStats == null ? null : indexingStats.getTotal().getDeleteCurrent());
             table.addCell(indexingStats == null ? null : indexingStats.getTotal().getDeleteTime());

src/main/java/org/elasticsearch/rest/action/cat/RestShardsAction.java

@@ -108,8 +108,6 @@ public class RestShardsAction extends AbstractCatAction {
         table.addCell("get.missing_time", "alias:gmti,getMissingTime;default:false;text-align:right;desc:time spent in failed gets");
         table.addCell("get.missing_total", "alias:gmto,getMissingTotal;default:false;text-align:right;desc:number of failed gets");
 
-        table.addCell("id_cache.memory_size", "alias:im,idCacheMemory;default:false;text-align:right;desc:used id cache");
-
         table.addCell("indexing.delete_current", "alias:idc,indexingDeleteCurrent;default:false;text-align:right;desc:number of current deletions");
         table.addCell("indexing.delete_time", "alias:idti,indexingDeleteTime;default:false;text-align:right;desc:time spent in deletions");
         table.addCell("indexing.delete_total", "alias:idto,indexingDeleteTotal;default:false;text-align:right;desc:number of delete ops");
@@ -229,8 +227,6 @@ public class RestShardsAction extends AbstractCatAction {
             table.addCell(shardStats == null ? null : shardStats.getGet().getMissingTime());
             table.addCell(shardStats == null ? null : shardStats.getGet().getMissingCount());
 
-            table.addCell(shardStats == null ? null : shardStats.getIdCache().getMemorySize());
-
             table.addCell(shardStats == null ? null : shardStats.getIndexing().getTotal().getDeleteCurrent());
             table.addCell(shardStats == null ? null : shardStats.getIndexing().getTotal().getDeleteTime());
             table.addCell(shardStats == null ? null : shardStats.getIndexing().getTotal().getDeleteCount());

src/test/java/org/elasticsearch/action/admin/indices/cache/clear/ClearIndicesCacheBlocksTests.java

@@ -44,7 +44,7 @@ public class ClearIndicesCacheBlocksTests extends ElasticsearchIntegrationTest {
         for (String blockSetting : Arrays.asList(SETTING_BLOCKS_READ, SETTING_BLOCKS_WRITE)) {
             try {
                 enableIndexBlock("test", blockSetting);
-                ClearIndicesCacheResponse clearIndicesCacheResponse = client().admin().indices().prepareClearCache("test").setFieldDataCache(true).setFilterCache(true).setIdCache(true).execute().actionGet();
+                ClearIndicesCacheResponse clearIndicesCacheResponse = client().admin().indices().prepareClearCache("test").setFieldDataCache(true).setFilterCache(true).setFieldDataCache(true).execute().actionGet();
                 assertNoFailures(clearIndicesCacheResponse);
                 assertThat(clearIndicesCacheResponse.getSuccessfulShards(), equalTo(numShards.totalNumShards));
             } finally {
@@ -55,7 +55,7 @@ public class ClearIndicesCacheBlocksTests extends ElasticsearchIntegrationTest {
         for (String blockSetting : Arrays.asList(SETTING_READ_ONLY, SETTING_BLOCKS_METADATA)) {
             try {
                 enableIndexBlock("test", blockSetting);
-                assertBlocked(client().admin().indices().prepareClearCache("test").setFieldDataCache(true).setFilterCache(true).setIdCache(true));
+                assertBlocked(client().admin().indices().prepareClearCache("test").setFieldDataCache(true).setFilterCache(true).setFieldDataCache(true));
             } finally {
                 disableIndexBlock("test", blockSetting);
             }

src/test/java/org/elasticsearch/benchmark/search/child/ChildSearchBenchmark.java

@@ -260,7 +260,7 @@ public class ChildSearchBenchmark {
         statsResponse = client.admin().cluster().prepareNodesStats()
                 .setJvm(true).setIndices(true).execute().actionGet();
 
-        System.out.println("--> Id cache size: " + statsResponse.getNodes()[0].getIndices().getIdCache().getMemorySize());
+        System.out.println("--> Field data size: " + statsResponse.getNodes()[0].getIndices().getFieldData().getMemorySize());
         System.out.println("--> Used heap size: " + statsResponse.getNodes()[0].getJvm().getMem().getHeapUsed());
 
         System.out.println("--> Running has_child query with score type");
@@ -319,7 +319,7 @@ public class ChildSearchBenchmark {
         statsResponse = client.admin().cluster().prepareNodesStats()
                 .setJvm(true).setIndices(true).execute().actionGet();
 
-        System.out.println("--> Id cache size: " + statsResponse.getNodes()[0].getIndices().getIdCache().getMemorySize());
+        System.out.println("--> Field data size: " + statsResponse.getNodes()[0].getIndices().getFieldData().getMemorySize());
         System.out.println("--> Used heap size: " + statsResponse.getNodes()[0].getJvm().getMem().getHeapUsed());
 
         client.close();

src/test/java/org/elasticsearch/benchmark/search/child/ChildSearchShortCircuitBenchmark.java

@@ -171,7 +171,7 @@ public class ChildSearchShortCircuitBenchmark {
         statsResponse = client.admin().cluster().prepareNodesStats()
                 .setJvm(true).setIndices(true).execute().actionGet();
 
-        System.out.println("--> Id cache size: " + statsResponse.getNodes()[0].getIndices().getIdCache().getMemorySize());
+        System.out.println("--> Field data size: " + statsResponse.getNodes()[0].getIndices().getFieldData().getMemorySize());
         System.out.println("--> Used heap size: " + statsResponse.getNodes()[0].getJvm().getMem().getHeapUsed());
 
         totalQueryTime = 0;
@@ -192,7 +192,7 @@ public class ChildSearchShortCircuitBenchmark {
         statsResponse = client.admin().cluster().prepareNodesStats()
                 .setJvm(true).setIndices(true).execute().actionGet();
 
-        System.out.println("--> Id cache size: " + statsResponse.getNodes()[0].getIndices().getIdCache().getMemorySize());
+        System.out.println("--> Field data size: " + statsResponse.getNodes()[0].getIndices().getFieldData().getMemorySize());
         System.out.println("--> Used heap size: " + statsResponse.getNodes()[0].getJvm().getMem().getHeapUsed());
 
         client.close();

src/test/java/org/elasticsearch/document/DocumentActionsTests.java

@@ -77,7 +77,7 @@ public class DocumentActionsTests extends ElasticsearchIntegrationTest {
         assertThat(indexExists("test1234565"), equalTo(false));
 
         logger.info("Clearing cache");
-        ClearIndicesCacheResponse clearIndicesCacheResponse = client().admin().indices().clearCache(clearIndicesCacheRequest("test").recycler(true).fieldDataCache(true).filterCache(true).idCache(true)).actionGet();
+        ClearIndicesCacheResponse clearIndicesCacheResponse = client().admin().indices().clearCache(clearIndicesCacheRequest("test").recycler(true).fieldDataCache(true).filterCache(true)).actionGet();
         assertNoFailures(clearIndicesCacheResponse);
         assertThat(clearIndicesCacheResponse.getSuccessfulShards(), equalTo(numShards.totalNumShards));
 

src/test/java/org/elasticsearch/indices/stats/IndexStatsTests.java

@@ -639,7 +639,7 @@ public class IndexStatsTests extends ElasticsearchIntegrationTest {
     @Test
     public void testFlagOrdinalOrder() {
         Flag[] flags = new Flag[]{Flag.Store, Flag.Indexing, Flag.Get, Flag.Search, Flag.Merge, Flag.Flush, Flag.Refresh,
-                Flag.FilterCache, Flag.IdCache, Flag.FieldData, Flag.Docs, Flag.Warmer, Flag.Percolate, Flag.Completion, Flag.Segments,
+                Flag.FilterCache, Flag.FieldData, Flag.Docs, Flag.Warmer, Flag.Percolate, Flag.Completion, Flag.Segments,
                 Flag.Translog, Flag.Suggest, Flag.QueryCache, Flag.Recovery};
 
         assertThat(flags.length, equalTo(Flag.values().length));
@@ -872,9 +872,6 @@ public class IndexStatsTests extends ElasticsearchIntegrationTest {
             case Get:
                 builder.setGet(set);
                 break;
-            case IdCache:
-                builder.setIdCache(set);
-                break;
             case Indexing:
                 builder.setIndexing(set);
                 break;
@@ -932,8 +929,6 @@ public class IndexStatsTests extends ElasticsearchIntegrationTest {
                 return response.getFlush() != null;
             case Get:
                 return response.getGet() != null;
-            case IdCache:
-                return response.getIdCache() != null;
             case Indexing:
                 return response.getIndexing() != null;
             case Merge:

src/test/java/org/elasticsearch/search/child/ParentFieldLoadingTest.java

@@ -71,7 +71,7 @@ public class ParentFieldLoadingTest extends ElasticsearchIntegrationTest {
         refresh();
 
         ClusterStatsResponse response = client().admin().cluster().prepareClusterStats().get();
-        assertThat(response.getIndicesStats().getIdCache().getMemorySizeInBytes(), equalTo(0l));
+        assertThat(response.getIndicesStats().getFieldData().getMemorySizeInBytes(), equalTo(0l));
 
         logger.info("testing default loading...");
         assertAcked(client().admin().indices().prepareDelete("test").get());
@@ -86,8 +86,8 @@ public class ParentFieldLoadingTest extends ElasticsearchIntegrationTest {
         refresh();
 
         response = client().admin().cluster().prepareClusterStats().get();
-        long idCacheSizeDefault = response.getIndicesStats().getIdCache().getMemorySizeInBytes();
-        assertThat(idCacheSizeDefault, greaterThan(0l));
+        long fielddataSizeDefault = response.getIndicesStats().getFieldData().getMemorySizeInBytes();
+        assertThat(fielddataSizeDefault, greaterThan(0l));
 
         logger.info("testing eager loading...");
         assertAcked(client().admin().indices().prepareDelete("test").get());
@@ -102,7 +102,7 @@ public class ParentFieldLoadingTest extends ElasticsearchIntegrationTest {
         refresh();
 
         response = client().admin().cluster().prepareClusterStats().get();
-        assertThat(response.getIndicesStats().getIdCache().getMemorySizeInBytes(), equalTo(idCacheSizeDefault));
+        assertThat(response.getIndicesStats().getFieldData().getMemorySizeInBytes(), equalTo(fielddataSizeDefault));
 
         logger.info("testing eager global ordinals loading...");
         assertAcked(client().admin().indices().prepareDelete("test").get());
@@ -113,14 +113,14 @@ public class ParentFieldLoadingTest extends ElasticsearchIntegrationTest {
         ensureGreen();
 
         // Need to do 2 separate refreshes, otherwise we have 1 segment and then we can't measure if global ordinals
-        // is loaded by the size of the id_cache, because global ordinals on 1 segment shards takes no extra memory.
+        // is loaded by the size of the field data cache, because global ordinals on 1 segment shards takes no extra memory.
         client().prepareIndex("test", "parent", "1").setSource("{}").get();
         refresh();
         client().prepareIndex("test", "child", "1").setParent("1").setSource("{}").get();
         refresh();
 
         response = client().admin().cluster().prepareClusterStats().get();
-        assertThat(response.getIndicesStats().getIdCache().getMemorySizeInBytes(), greaterThan(idCacheSizeDefault));
+        assertThat(response.getIndicesStats().getFieldData().getMemorySizeInBytes(), greaterThan(fielddataSizeDefault));
     }
 
     @Test
@@ -136,8 +136,8 @@ public class ParentFieldLoadingTest extends ElasticsearchIntegrationTest {
         refresh();
 
         ClusterStatsResponse response = client().admin().cluster().prepareClusterStats().get();
-        long idCacheSizeDefault = response.getIndicesStats().getIdCache().getMemorySizeInBytes();
-        assertThat(idCacheSizeDefault, greaterThan(0l));
+        long fielddataSizeDefault = response.getIndicesStats().getFieldData().getMemorySizeInBytes();
+        assertThat(fielddataSizeDefault, greaterThan(0l));
 
         PutMappingResponse putMappingResponse = client().admin().indices().preparePutMapping("test").setType("child")
                 .setSource(childMapping(FieldMapper.Loading.EAGER_GLOBAL_ORDINALS))
@@ -165,11 +165,11 @@ public class ParentFieldLoadingTest extends ElasticsearchIntegrationTest {
         });
 
         // Need to add a new doc otherwise the refresh doesn't trigger a new searcher
-        // Because it ends up in its own segment, but isn't of type parent or child, this doc doesn't contribute to the size of the id_cache
+        // Because it ends up in its own segment, but isn't of type parent or child, this doc doesn't contribute to the size of the fielddata cache
         client().prepareIndex("test", "dummy", "dummy").setSource("{}").get();
         refresh();
         response = client().admin().cluster().prepareClusterStats().get();
-        assertThat(response.getIndicesStats().getIdCache().getMemorySizeInBytes(), greaterThan(idCacheSizeDefault));
+        assertThat(response.getIndicesStats().getFieldData().getMemorySizeInBytes(), greaterThan(fielddataSizeDefault));
     }
 
     private XContentBuilder childMapping(FieldMapper.Loading loading) throws IOException {

src/test/java/org/elasticsearch/search/child/SimpleChildQuerySearchTests.java

@@ -286,8 +286,7 @@ public class SimpleChildQuerySearchTests extends ElasticsearchIntegrationTest {
 
     @Test
     @LuceneTestCase.AwaitsFix(bugUrl = "https://github.com/elasticsearch/elasticsearch/issues/9270")
-    public void testClearIdCacheBug() throws Exception {
-        // enforce lazy loading to make sure that p/c stats are not counted as part of field data
+    public void testParentFieldDataCacheBug() throws Exception {
         assertAcked(prepareCreate("test")
                 .setSettings(ImmutableSettings.builder().put(indexSettings())
                         .put("index.refresh_interval", -1)) // Disable automatic refresh, so that the _parent doesn't get warmed
@@ -307,10 +306,10 @@ public class SimpleChildQuerySearchTests extends ElasticsearchIntegrationTest {
         client().prepareIndex("test", "parent", "p1").setSource("p_field", "p_value1").get();
 
         refresh();
-        // No _parent field yet, there shouldn't be anything in the parent id cache
+        // No _parent field yet, there shouldn't be anything in the field data for _parent field
         IndicesStatsResponse indicesStatsResponse = client().admin().indices()
-                .prepareStats("test").setIdCache(true).get();
-        assertThat(indicesStatsResponse.getTotal().getIdCache().getMemorySizeInBytes(), equalTo(0l));
+                .prepareStats("test").setFieldData(true).get();
+        assertThat(indicesStatsResponse.getTotal().getFieldData().getMemorySizeInBytes(), equalTo(0l));
 
         // Now add mapping + children
         client().admin().indices().preparePutMapping("test").setType("child")
@@ -338,12 +337,9 @@ public class SimpleChildQuerySearchTests extends ElasticsearchIntegrationTest {
         refresh();
 
         indicesStatsResponse = client().admin().indices()
-                .prepareStats("test").setFieldData(true).get();
-        // automatic warm-up has populated the cache since it found a parent field mapper
-        assertThat(indicesStatsResponse.getTotal().getIdCache().getMemorySizeInBytes(), greaterThan(0l));
-        // Even though p/c is field data based the stats stay zero, because _parent field data field is kept
-        // track of under id cache stats memory wise for bwc
-        assertThat(indicesStatsResponse.getTotal().getFieldData().getMemorySizeInBytes(), equalTo(0l));
+                .prepareStats("test").setFieldData(true).setFieldDataFields("_parent").get();
+        assertThat(indicesStatsResponse.getTotal().getFieldData().getMemorySizeInBytes(), greaterThan(0l));
+        assertThat(indicesStatsResponse.getTotal().getFieldData().getFields().get("_parent"), greaterThan(0l));
 
         SearchResponse searchResponse = client().prepareSearch("test")
                 .setQuery(constantScoreQuery(hasChildQuery("child", termQuery("c_field", "blue"))))
@@ -352,17 +348,17 @@ public class SimpleChildQuerySearchTests extends ElasticsearchIntegrationTest {
         assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
 
         indicesStatsResponse = client().admin().indices()
-                .prepareStats("test").setFieldData(true).get();
-        assertThat(indicesStatsResponse.getTotal().getIdCache().getMemorySizeInBytes(), greaterThan(0l));
-        assertThat(indicesStatsResponse.getTotal().getFieldData().getMemorySizeInBytes(), equalTo(0l));
+                .prepareStats("test").setFieldData(true).setFieldDataFields("_parent").get();
+        assertThat(indicesStatsResponse.getTotal().getFieldData().getMemorySizeInBytes(), greaterThan(0l));
+        assertThat(indicesStatsResponse.getTotal().getFieldData().getFields().get("_parent"), greaterThan(0l));
 
-        ClearIndicesCacheResponse clearCacheResponse = client().admin().indices().prepareClearCache("test").setIdCache(true).get();
+        ClearIndicesCacheResponse clearCacheResponse = client().admin().indices().prepareClearCache("test").setFieldDataCache(true).get();
         assertNoFailures(clearCacheResponse);
         assertAllSuccessful(clearCacheResponse);
         indicesStatsResponse = client().admin().indices()
-                .prepareStats("test").setFieldData(true).get();
-        assertThat(indicesStatsResponse.getTotal().getIdCache().getMemorySizeInBytes(), equalTo(0l));
+                .prepareStats("test").setFieldData(true).setFieldDataFields("_parent").get();
         assertThat(indicesStatsResponse.getTotal().getFieldData().getMemorySizeInBytes(), equalTo(0l));
+        assertThat(indicesStatsResponse.getTotal().getFieldData().getFields().get("_parent"), equalTo(0l));
     }
 
     @Test