Remove back compat layer with 2.x indices. (#26245)

As of 6.0 we do not need to support 2.x indices.

core/src/main/java/org/elasticsearch/cluster/metadata/IndexTemplateMetaData.java

@@ -231,9 +231,7 @@ public class IndexTemplateMetaData extends AbstractDiffable<IndexTemplateMetaDat
             IndexMetaData.Custom customIndexMetaData = IndexMetaData.lookupPrototypeSafe(type).readFrom(in);
             builder.putCustom(type, customIndexMetaData);
         }
-        if (in.getVersion().onOrAfter(Version.V_5_0_0_beta1)) {
-            builder.version(in.readOptionalVInt());
-        }
+        builder.version(in.readOptionalVInt());
         return builder.build();
     }
 
@@ -265,9 +263,7 @@ public class IndexTemplateMetaData extends AbstractDiffable<IndexTemplateMetaDat
             out.writeString(cursor.key);
             cursor.value.writeTo(out);
         }
-        if (out.getVersion().onOrAfter(Version.V_5_0_0_beta1)) {
-            out.writeOptionalVInt(version);
-        }
+        out.writeOptionalVInt(version);
     }
 
     public static class Builder {

core/src/main/java/org/elasticsearch/index/analysis/AnalysisRegistry.java

@@ -557,20 +557,7 @@ public final class AnalysisRegistry implements Closeable {
         // TODO: remove alias support completely when we no longer support pre 5.0 indices
         final String analyzerAliasKey = "index.analysis.analyzer." + analyzerFactory.name() + ".alias";
         if (indexSettings.getSettings().get(analyzerAliasKey) != null) {
-            if (indexSettings.getIndexVersionCreated().onOrAfter(Version.V_5_0_0_beta1)) {
-                // do not allow alias creation if the index was created on or after v5.0 alpha6
-                throw new IllegalArgumentException("setting [" + analyzerAliasKey + "] is not supported");
-            }
-
-            // the setting is now removed but we only support it for loading indices created before v5.0
-            deprecationLogger.deprecated("setting [{}] is only allowed on index [{}] because it was created before 5.x; " +
-                "analyzer aliases can no longer be created on new indices.", analyzerAliasKey, indexSettings.getIndex().getName());
-            Set<String> aliases = Sets.newHashSet(indexSettings.getSettings().getAsArray(analyzerAliasKey));
-            for (String alias : aliases) {
-                if (analyzerAliases.putIfAbsent(alias, analyzer) != null) {
-                    throw new IllegalStateException("alias [" + alias + "] is already used by [" + analyzerAliases.get(alias).name() + "]");
-                }
-            }
+            throw new IllegalArgumentException("setting [" + analyzerAliasKey + "] is not supported");
         }
     }
 

core/src/main/java/org/elasticsearch/index/mapper/DynamicTemplate.java

@@ -186,7 +186,7 @@ public class DynamicTemplate implements ToXContentObject {
                 matchPattern = entry.getValue().toString();
             } else if ("mapping".equals(propName)) {
                 mapping = (Map<String, Object>) entry.getValue();
-            } else if (indexVersionCreated.onOrAfter(Version.V_5_0_0_alpha1)) {
+            } else {
                 // unknown parameters were ignored before but still carried through serialization
                 // so we need to ignore them at parsing time for old indices
                 throw new IllegalArgumentException("Illegal dynamic template parameter: [" + propName + "]");

core/src/main/java/org/elasticsearch/index/mapper/FieldMapper.java

@@ -212,19 +212,11 @@ public abstract class FieldMapper extends Mapper implements Cloneable {
         }
 
         protected boolean defaultDocValues(Version indexCreated) {
-            if (indexCreated.onOrAfter(Version.V_5_0_0_alpha1)) {
-                // add doc values by default to keyword (boolean, numerics, etc.) fields
-                return fieldType.tokenized() == false;
-            } else {
-                return fieldType.tokenized() == false && fieldType.indexOptions() != IndexOptions.NONE;
-            }
+            return fieldType.tokenized() == false;
         }
 
         protected void setupFieldType(BuilderContext context) {
             fieldType.setName(buildFullName(context));
-            if (context.indexCreatedVersion().before(Version.V_5_0_0_alpha1)) {
-                fieldType.setOmitNorms(fieldType.omitNorms() && fieldType.boost() == 1.0f);
-            }
             if (fieldType.indexAnalyzer() == null && fieldType.tokenized() == false && fieldType.indexOptions() != IndexOptions.NONE) {
                 fieldType.setIndexAnalyzer(Lucene.KEYWORD_ANALYZER);
                 fieldType.setSearchAnalyzer(Lucene.KEYWORD_ANALYZER);
@@ -247,10 +239,8 @@ public abstract class FieldMapper extends Mapper implements Cloneable {
         super(simpleName);
         assert indexSettings != null;
         this.indexCreatedVersion = Version.indexCreated(indexSettings);
-        if (indexCreatedVersion.onOrAfter(Version.V_5_0_0_beta1)) {
-            if (simpleName.isEmpty()) {
-                throw new IllegalArgumentException("name cannot be empty string");
-            }
+        if (simpleName.isEmpty()) {
+            throw new IllegalArgumentException("name cannot be empty string");
         }
         fieldType.freeze();
         this.fieldType = fieldType;

core/src/main/java/org/elasticsearch/index/mapper/IndexFieldMapper.java

@@ -77,10 +77,7 @@ public class IndexFieldMapper extends MetadataFieldMapper {
     public static class TypeParser implements MetadataFieldMapper.TypeParser {
         @Override
         public MetadataFieldMapper.Builder<?,?> parse(String name, Map<String, Object> node, ParserContext parserContext) throws MapperParsingException {
-            if (parserContext.indexVersionCreated().onOrAfter(Version.V_5_0_0_alpha3)) {
-                throw new MapperParsingException(NAME + " is not configurable");
-            }
-            return new Builder(parserContext.mapperService().fullName(NAME));
+            throw new MapperParsingException(NAME + " is not configurable");
         }
 
         @Override

core/src/main/java/org/elasticsearch/index/mapper/ObjectMapper.java

@@ -321,11 +321,8 @@ public class ObjectMapper extends Mapper implements Cloneable {
             Boolean includeInAll, Map<String, Mapper> mappers, Settings settings) {
         super(name);
         assert settings != null;
-        Version indexCreatedVersion = Version.indexCreated(settings);
-        if (indexCreatedVersion.onOrAfter(Version.V_5_0_0_beta1)) {
-            if (name.isEmpty()) {
-                throw new IllegalArgumentException("name cannot be empty string");
-            }
+        if (name.isEmpty()) {
+            throw new IllegalArgumentException("name cannot be empty string");
         }
         this.fullPath = fullPath;
         this.enabled = enabled;

core/src/main/java/org/elasticsearch/index/mapper/SourceFieldMapper.java

@@ -116,9 +116,6 @@ public class SourceFieldMapper extends MetadataFieldMapper {
                 if (fieldName.equals("enabled")) {
                     builder.enabled(TypeParsers.nodeBooleanValue(name, "enabled", fieldNode, parserContext));
                     iterator.remove();
-                } else if ("format".equals(fieldName) && parserContext.indexVersionCreated().before(Version.V_5_0_0_alpha1)) {
-                    // ignore on old indices, reject on and after 5.0
-                    iterator.remove();
                 } else if (fieldName.equals("includes")) {
                     List<Object> values = (List<Object>) fieldNode;
                     String[] includes = new String[values.size()];

core/src/main/java/org/elasticsearch/index/mapper/TermBasedFieldType.java

@@ -27,7 +27,6 @@ import org.apache.lucene.search.Query;
 import org.apache.lucene.search.TermInSetQuery;
 import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.util.BytesRef;
-import org.elasticsearch.Version;
 import org.elasticsearch.common.lucene.BytesRefs;
 import org.elasticsearch.index.query.QueryShardContext;
 
@@ -51,12 +50,11 @@ abstract class TermBasedFieldType extends MappedFieldType {
     @Override
     public Query termQuery(Object value, QueryShardContext context) {
         failIfNotIndexed();
-        TermQuery query = new TermQuery(new Term(name(), indexedValueForSearch(value)));
-        if (boost() == 1f ||
-            (context != null && context.indexVersionCreated().before(Version.V_5_0_0_alpha1))) {
-            return query;
+        Query query = new TermQuery(new Term(name(), indexedValueForSearch(value)));
+        if (boost() != 1f) {
+            query = new BoostQuery(query, boost());
         }
-        return new BoostQuery(query, boost());
+        return query;
     }
 
     @Override

core/src/main/java/org/elasticsearch/index/mapper/TypeParsers.java

@@ -35,11 +35,9 @@ import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 
 import static org.elasticsearch.common.xcontent.support.XContentMapValues.isArray;
 import static org.elasticsearch.common.xcontent.support.XContentMapValues.nodeFloatValue;
-import static org.elasticsearch.common.xcontent.support.XContentMapValues.nodeMapValue;
 import static org.elasticsearch.common.xcontent.support.XContentMapValues.nodeStringValue;
 
 public class TypeParsers {
@@ -158,37 +156,9 @@ public class TypeParsers {
         }
     }
 
-    public static boolean parseNorms(FieldMapper.Builder builder, String fieldName, String propName, Object propNode,
+    public static void parseNorms(FieldMapper.Builder builder, String fieldName, Object propNode,
                                      Mapper.TypeParser.ParserContext parserContext) {
-        if (propName.equals("norms")) {
-            if (propNode instanceof Map) {
-                final Map<String, Object> properties = nodeMapValue(propNode, "norms");
-                for (Iterator<Entry<String, Object>> propsIterator = properties.entrySet().iterator(); propsIterator.hasNext(); ) {
-                    Entry<String, Object> entry2 = propsIterator.next();
-                    final String propName2 = entry2.getKey();
-                    final Object propNode2 = entry2.getValue();
-                    if (propName2.equals("enabled")) {
-                        builder.omitNorms(nodeBooleanValue(fieldName, "enabled", propNode2, parserContext) == false);
-                        propsIterator.remove();
-                    } else if (propName2.equals("loading")) {
-                        // ignore for bw compat
-                        propsIterator.remove();
-                    }
-                }
-                DocumentMapperParser.checkNoRemainingFields(propName, properties, parserContext.indexVersionCreated());
-                DEPRECATION_LOGGER.deprecated("The [norms{enabled:true/false}] way of specifying norms is deprecated, please use " +
-                    "[norms:true/false] instead");
-            } else {
-                builder.omitNorms(nodeBooleanValue(fieldName,"norms", propNode, parserContext) == false);
-            }
-            return true;
-        } else if (propName.equals("omit_norms")) {
-            builder.omitNorms(nodeBooleanValue(fieldName,"norms", propNode, parserContext));
-            DEPRECATION_LOGGER.deprecated("[omit_norms] is deprecated, please use [norms] instead with the opposite boolean value");
-            return true;
-        } else {
-            return false;
-        }
+        builder.omitNorms(nodeBooleanValue(fieldName, "norms", propNode, parserContext) == false);
     }
 
     /**
@@ -203,7 +173,8 @@ public class TypeParsers {
             Map.Entry<String, Object> entry = iterator.next();
             final String propName = entry.getKey();
             final Object propNode = entry.getValue();
-            if (parseNorms(builder, name, propName, propNode, parserContext)) {
+            if ("norms".equals(propName)) {
+                parseNorms(builder, name, propNode, parserContext);
                 iterator.remove();
             }
         }
@@ -237,9 +208,6 @@ public class TypeParsers {
             } else if (propName.equals("boost")) {
                 builder.boost(nodeFloatValue(propNode));
                 iterator.remove();
-            } else if (parserContext.indexVersionCreated().before(Version.V_5_0_0_alpha1)
-                && parseNorms(builder, name, propName, propNode, parserContext)) {
-                iterator.remove();
             } else if (propName.equals("index_options")) {
                 builder.indexOptions(nodeIndexOptionValue(propNode));
                 iterator.remove();
@@ -259,11 +227,6 @@ public class TypeParsers {
                 SimilarityProvider similarityProvider = resolveSimilarity(parserContext, name, propNode.toString());
                 builder.similarity(similarityProvider);
                 iterator.remove();
-            } else if (propName.equals("fielddata")
-                    && propNode instanceof Map
-                    && parserContext.indexVersionCreated().before(Version.V_5_0_0_alpha1)) {
-                // ignore for bw compat
-                iterator.remove();
             } else if (parseMultiField(builder, name, parserContext, propName, propNode)) {
                 iterator.remove();
             } else if (propName.equals("copy_to")) {
@@ -387,10 +350,6 @@ public class TypeParsers {
     }
 
     private static SimilarityProvider resolveSimilarity(Mapper.TypeParser.ParserContext parserContext, String name, String value) {
-        if (parserContext.indexVersionCreated().before(Version.V_5_0_0_alpha1) && "default".equals(value)) {
-            // "default" similarity has been renamed into "classic" in 3.x.
-            value = "classic";
-        }
         SimilarityProvider similarityProvider = parserContext.getSimilarity(value);
         if (similarityProvider == null) {
             throw new MapperParsingException("Unknown Similarity type [" + value + "] for field [" + name + "]");

core/src/main/java/org/elasticsearch/index/similarity/SimilarityService.java

@@ -79,8 +79,7 @@ public final class SimilarityService extends AbstractIndexComponent {
         Map<String, Settings> similaritySettings = this.indexSettings.getSettings().getGroups(IndexModule.SIMILARITY_SETTINGS_PREFIX);
         for (Map.Entry<String, Settings> entry : similaritySettings.entrySet()) {
             String name = entry.getKey();
-            // Starting with v5.0 indices, it should no longer be possible to redefine built-in similarities
-            if(BUILT_IN.containsKey(name) && indexSettings.getIndexVersionCreated().onOrAfter(Version.V_5_0_0_alpha1)) {
+            if (BUILT_IN.containsKey(name)) {
                 throw new IllegalArgumentException("Cannot redefine built-in Similarity [" + name + "]");
             }
             Settings providerSettings = entry.getValue();
@@ -97,10 +96,6 @@ public final class SimilarityService extends AbstractIndexComponent {
         Map<String, SimilarityProvider> providerMapping = addSimilarities(similaritySettings, indexSettings.getSettings(), scriptService,
                 DEFAULTS);
         for (Map.Entry<String, SimilarityProvider> entry : providerMapping.entrySet()) {
-            // Avoid overwriting custom providers for indices older that v5.0
-            if (providers.containsKey(entry.getKey()) && indexSettings.getIndexVersionCreated().before(Version.V_5_0_0_alpha1)) {
-                continue;
-            }
             providers.put(entry.getKey(), entry.getValue());
         }
         this.similarities = providers;