Change the field mapping index time boost into a query time boost.

Index time boost will still be applied for indices created before 5.0.0.

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

@@ -98,7 +98,6 @@ class DocumentParser implements Closeable {
         }
 
         reverseOrder(context);
-        applyDocBoost(context);
 
         ParsedDocument doc = parsedDocument(source, context, update(context, mapping));
         // reset the context to free up memory
@@ -186,24 +185,6 @@ class DocumentParser implements Closeable {
         }
     }
 
-    private static void applyDocBoost(ParseContext.InternalParseContext context) {
-        // apply doc boost
-        if (context.docBoost() != 1.0f) {
-            Set<String> encounteredFields = new HashSet<>();
-            for (ParseContext.Document doc : context.docs()) {
-                encounteredFields.clear();
-                for (IndexableField field : doc) {
-                    if (field.fieldType().indexOptions() != IndexOptions.NONE && !field.fieldType().omitNorms()) {
-                        if (!encounteredFields.contains(field.name())) {
-                            ((Field) field).setBoost(context.docBoost() * field.boost());
-                            encounteredFields.add(field.name());
-                        }
-                    }
-                }
-            }
-        }
-    }
-
     private static ParsedDocument parsedDocument(SourceToParse source, ParseContext.InternalParseContext context, Mapping update) {
         return new ParsedDocument(
             context.uid(),

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

@@ -300,7 +300,8 @@ public abstract class FieldMapper extends Mapper implements Cloneable {
             for (Field field : fields) {
                 if (!customBoost()
                         // don't set boosts eg. on dv fields
-                        && field.fieldType().indexOptions() != IndexOptions.NONE) {
+                        && field.fieldType().indexOptions() != IndexOptions.NONE
+                        && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
                     field.setBoost(fieldType().boost());
                 }
                 context.doc().add(field);

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

@@ -32,7 +32,9 @@ import org.apache.lucene.search.Query;
 import org.apache.lucene.search.RegexpQuery;
 import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.search.TermRangeQuery;
+import org.apache.lucene.search.BoostQuery;
 import org.apache.lucene.util.BytesRef;
+import org.elasticsearch.Version;
 import org.elasticsearch.action.fieldstats.FieldStats;
 import org.elasticsearch.common.Nullable;
 import org.elasticsearch.common.Strings;
@@ -398,7 +400,12 @@ public abstract class MappedFieldType extends FieldType {
     }
 
     public Query termQuery(Object value, @Nullable QueryShardContext context) {
-        return new TermQuery(createTerm(value));
+        TermQuery query = new TermQuery(createTerm(value));
+        if (boost == 1f ||
+            (context != null && context.indexVersionCreated().before(Version.V_5_0_0))) {
+            return query;
+        }
+        return new BoostQuery(query, boost);
     }
 
     public Query termsQuery(List values, @Nullable QueryShardContext context) {

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

@@ -321,16 +321,6 @@ public abstract class ParseContext {
             return in.externalValue();
         }
 
-        @Override
-        public float docBoost() {
-            return in.docBoost();
-        }
-
-        @Override
-        public void docBoost(float docBoost) {
-            in.docBoost(docBoost);
-        }
-
         @Override
         public StringBuilder stringBuilder() {
             return in.stringBuilder();
@@ -375,8 +365,6 @@ public abstract class ParseContext {
 
         private AllEntries allEntries = new AllEntries();
 
-        private float docBoost = 1.0f;
-
         private Mapper dynamicMappingsUpdate = null;
 
         public InternalParseContext(@Nullable Settings indexSettings, DocumentMapperParser docMapperParser, DocumentMapper docMapper, ContentPath path) {
@@ -402,7 +390,6 @@ public abstract class ParseContext {
             this.source = source == null ? null : sourceToParse.source();
             this.path.reset();
             this.allEntries = new AllEntries();
-            this.docBoost = 1.0f;
             this.dynamicMappingsUpdate = null;
         }
 
@@ -534,16 +521,6 @@ public abstract class ParseContext {
             return this.allEntries;
         }
 
-        @Override
-        public float docBoost() {
-            return this.docBoost;
-        }
-
-        @Override
-        public void docBoost(float docBoost) {
-            this.docBoost = docBoost;
-        }
-
         /**
          * A string builder that can be used to construct complex names for example.
          * Its better to reuse the.
@@ -759,10 +736,6 @@ public abstract class ParseContext {
         return clazz.cast(externalValue());
     }
 
-    public abstract float docBoost();
-
-    public abstract void docBoost(float docBoost);
-
     /**
      * A string builder that can be used to construct complex names for example.
      * Its better to reuse the.

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

@@ -285,7 +285,9 @@ public class ByteFieldMapper extends NumberFieldMapper {
         }
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomByteNumericField field = new CustomByteNumericField(value, fieldType());
-            field.setBoost(boost);
+            if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(boost);
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

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

@@ -513,7 +513,9 @@ public class DateFieldMapper extends NumberFieldMapper {
         if (value != null) {
             if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
                 CustomLongNumericField field = new CustomLongNumericField(value, fieldType());
-                field.setBoost(boost);
+                if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                    field.setBoost(boost);
+                }
                 fields.add(field);
             }
             if (fieldType().hasDocValues()) {

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

@@ -278,7 +278,9 @@ public class DoubleFieldMapper extends NumberFieldMapper {
 
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomDoubleNumericField field = new CustomDoubleNumericField(value, fieldType());
-            field.setBoost(boost);
+            if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(boost);
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

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

@@ -290,7 +290,9 @@ public class FloatFieldMapper extends NumberFieldMapper {
 
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomFloatNumericField field = new CustomFloatNumericField(value, fieldType());
-            field.setBoost(boost);
+            if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(boost);
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

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

@@ -298,7 +298,9 @@ public class IntegerFieldMapper extends NumberFieldMapper {
     protected void addIntegerFields(ParseContext context, List<Field> fields, int value, float boost) {
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomIntegerNumericField field = new CustomIntegerNumericField(value, fieldType());
-            field.setBoost(boost);
+            if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(boost);
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

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

@@ -282,7 +282,9 @@ public class LongFieldMapper extends NumberFieldMapper {
         }
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomLongNumericField field = new CustomLongNumericField(value, fieldType());
-            field.setBoost(boost);
+            if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(boost);
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

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

@@ -290,7 +290,9 @@ public class ShortFieldMapper extends NumberFieldMapper {
         }
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomShortNumericField field = new CustomShortNumericField(value, fieldType());
-            field.setBoost(boost);
+            if (boost != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(boost);
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

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

@@ -317,7 +317,9 @@ public class StringFieldMapper extends FieldMapper implements AllFieldMapper.Inc
 
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             Field field = new Field(fieldType().name(), valueAndBoost.value(), fieldType());
-            field.setBoost(valueAndBoost.boost());
+            if (valueAndBoost.boost() != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(valueAndBoost.boost());
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

core/src/main/java/org/elasticsearch/index/mapper/geo/GeoShapeFieldMapper.java

@@ -30,6 +30,7 @@ import org.apache.lucene.spatial.prefix.tree.GeohashPrefixTree;
 import org.apache.lucene.spatial.prefix.tree.PackedQuadPrefixTree;
 import org.apache.lucene.spatial.prefix.tree.QuadPrefixTree;
 import org.apache.lucene.spatial.prefix.tree.SpatialPrefixTree;
+import org.elasticsearch.Version;
 import org.elasticsearch.common.Explicit;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.geo.GeoUtils;
@@ -452,7 +453,8 @@ public class GeoShapeFieldMapper extends FieldMapper {
                 return null;
             }
             for (Field field : fields) {
-                if (!customBoost()) {
+                if (!customBoost() &&
+                    fieldType.boost() != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
                     field.setBoost(fieldType().boost());
                 }
                 context.doc().add(field);

core/src/main/java/org/elasticsearch/index/mapper/ip/IpFieldMapper.java

@@ -27,6 +27,7 @@ import org.apache.lucene.search.Query;
 import org.apache.lucene.util.BytesRef;
 import org.apache.lucene.util.BytesRefBuilder;
 import org.apache.lucene.util.NumericUtils;
+import org.elasticsearch.Version;
 import org.elasticsearch.common.Explicit;
 import org.elasticsearch.common.Nullable;
 import org.elasticsearch.common.Numbers;
@@ -305,7 +306,9 @@ public class IpFieldMapper extends NumberFieldMapper {
         final long value = ipToLong(ipAsString);
         if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
             CustomLongNumericField field = new CustomLongNumericField(value, fieldType());
-            field.setBoost(fieldType().boost());
+            if (fieldType.boost() != 1f && Version.indexCreated(context.indexSettings()).before(Version.V_5_0_0)) {
+                field.setBoost(fieldType().boost());
+            }
             fields.add(field);
         }
         if (fieldType().hasDocValues()) {

core/src/test/java/org/elasticsearch/index/mapper/boost/CustomBoostMappingTests.java

@@ -19,13 +19,18 @@
 
 package org.elasticsearch.index.mapper.boost;
 
+import org.apache.lucene.search.BoostQuery;
+import org.apache.lucene.search.TermQuery;
 import org.elasticsearch.Version;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.common.compress.CompressedXContent;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentFactory;
+import org.elasticsearch.index.IndexService;
+import org.elasticsearch.index.mapper.DocumentFieldMappers;
 import org.elasticsearch.index.mapper.DocumentMapper;
 import org.elasticsearch.index.mapper.ParsedDocument;
+import org.elasticsearch.index.query.QueryShardContext;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESSingleNodeTestCase;
 import org.elasticsearch.test.InternalSettingsPlugin;
@@ -33,6 +38,7 @@ import org.elasticsearch.test.InternalSettingsPlugin;
 import java.util.Collection;
 
 import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.instanceOf;
 
 public class CustomBoostMappingTests extends ESSingleNodeTestCase {
 
@@ -77,4 +83,87 @@ public class CustomBoostMappingTests extends ESSingleNodeTestCase {
         assertThat(doc.rootDoc().getField("f_field").boost(), equalTo(8.0f));
         assertThat(doc.rootDoc().getField("date_field").boost(), equalTo(9.0f));
     }
+
+    public void testBackCompatFieldMappingBoostValues() throws Exception {
+        String mapping = XContentFactory.jsonBuilder().startObject().startObject("type").startObject("properties")
+            .startObject("s_field").field("type", "keyword").field("boost", 2.0f).endObject()
+            .startObject("l_field").field("type", "long").field("boost", 3.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("i_field").field("type", "integer").field("boost", 4.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("sh_field").field("type", "short").field("boost", 5.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("b_field").field("type", "byte").field("boost", 6.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("d_field").field("type", "double").field("boost", 7.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("f_field").field("type", "float").field("boost", 8.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("date_field").field("type", "date").field("boost", 9.0f).startObject("norms").field("enabled", true).endObject().endObject()
+            .endObject().endObject().endObject().string();
+
+        {
+            IndexService indexService = createIndex("test", BW_SETTINGS);
+            QueryShardContext context = indexService.newQueryShardContext();
+            DocumentMapper mapper = indexService.mapperService().documentMapperParser().parse("type", new CompressedXContent(mapping));
+            DocumentFieldMappers fieldMappers = mapper.mappers();
+            assertThat(fieldMappers.getMapper("s_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("l_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("i_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("sh_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("b_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("d_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("f_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+            assertThat(fieldMappers.getMapper("date_field").fieldType().termQuery("0", context), instanceOf(TermQuery.class));
+
+            ParsedDocument doc = mapper.parse("test", "type", "1", XContentFactory.jsonBuilder().startObject()
+                .field("s_field", "s_value")
+                .field("l_field", 1L)
+                .field("i_field", 1)
+                .field("sh_field", 1)
+                .field("b_field", 1)
+                .field("d_field", 1)
+                .field("f_field", 1)
+                .field("date_field", "20100101")
+                .endObject().bytes());
+
+            assertThat(doc.rootDoc().getField("s_field").boost(), equalTo(2.0f));
+            assertThat(doc.rootDoc().getField("l_field").boost(), equalTo(3.0f));
+            assertThat(doc.rootDoc().getField("i_field").boost(), equalTo(4.0f));
+            assertThat(doc.rootDoc().getField("sh_field").boost(), equalTo(5.0f));
+            assertThat(doc.rootDoc().getField("b_field").boost(), equalTo(6.0f));
+            assertThat(doc.rootDoc().getField("d_field").boost(), equalTo(7.0f));
+            assertThat(doc.rootDoc().getField("f_field").boost(), equalTo(8.0f));
+            assertThat(doc.rootDoc().getField("date_field").boost(), equalTo(9.0f));
+        }
+
+        {
+            IndexService indexService = createIndex("text");
+            QueryShardContext context = indexService.newQueryShardContext();
+            DocumentMapper mapper = indexService.mapperService().documentMapperParser().parse("type", new CompressedXContent(mapping));
+            DocumentFieldMappers fieldMappers = mapper.mappers();
+            assertThat(fieldMappers.getMapper("s_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("l_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("i_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("sh_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("b_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("d_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("f_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+            assertThat(fieldMappers.getMapper("date_field").fieldType().termQuery("0", context), instanceOf(BoostQuery.class));
+
+            ParsedDocument doc = mapper.parse("test", "type", "1", XContentFactory.jsonBuilder().startObject()
+                .field("s_field", "s_value")
+                .field("l_field", 1L)
+                .field("i_field", 1)
+                .field("sh_field", 1)
+                .field("b_field", 1)
+                .field("d_field", 1)
+                .field("f_field", 1)
+                .field("date_field", "20100101")
+                .endObject().bytes());
+
+            assertThat(doc.rootDoc().getField("s_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("l_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("i_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("sh_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("b_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("d_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("f_field").boost(), equalTo(1f));
+            assertThat(doc.rootDoc().getField("date_field").boost(), equalTo(1f));
+        }
+    }
 }

core/src/test/java/org/elasticsearch/index/mapper/boost/FieldLevelBoostTests.java

@@ -36,6 +36,7 @@ import org.elasticsearch.test.InternalSettingsPlugin;
 import java.util.Collection;
 
 import static org.hamcrest.Matchers.closeTo;
+import static org.hamcrest.Matchers.equalTo;
 
 /**
  */
@@ -98,6 +99,97 @@ public class FieldLevelBoostTests extends ESSingleNodeTestCase {
         assertThat((double) f.boost(), closeTo(9.0, 0.001));
     }
 
+    public void testBackCompatFieldLevelMappingBoost() throws Exception {
+        String mapping = XContentFactory.jsonBuilder().startObject().startObject("person").startObject("properties")
+            .startObject("str_field").field("type", "keyword").field("boost", "2.0").endObject()
+            .startObject("int_field").field("type", "integer").field("boost", "3.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("byte_field").field("type", "byte").field("boost", "4.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("date_field").field("type", "date").field("boost", "5.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("double_field").field("type", "double").field("boost", "6.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("float_field").field("type", "float").field("boost", "7.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("long_field").field("type", "long").field("boost", "8.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .startObject("short_field").field("type", "short").field("boost", "9.0").startObject("norms").field("enabled", true).endObject().endObject()
+            .string();
+
+        {
+            DocumentMapper docMapper = createIndex("test", BW_SETTINGS).mapperService().documentMapperParser().parse("person", new CompressedXContent(mapping));
+            BytesReference json = XContentFactory.jsonBuilder().startObject()
+                .field("str_field", "some name")
+                .field("int_field", 10)
+                .field("byte_field", 20)
+                .field("date_field", "2012-01-10")
+                .field("double_field", 30.0)
+                .field("float_field", 40.0)
+                .field("long_field", 50)
+                .field("short_field", 60)
+                .bytes();
+            Document doc = docMapper.parse("test", "person", "1", json).rootDoc();
+
+            IndexableField f = doc.getField("str_field");
+            assertThat((double) f.boost(), closeTo(2.0, 0.001));
+
+            f = doc.getField("int_field");
+            assertThat((double) f.boost(), closeTo(3.0, 0.001));
+
+            f = doc.getField("byte_field");
+            assertThat((double) f.boost(), closeTo(4.0, 0.001));
+
+            f = doc.getField("date_field");
+            assertThat((double) f.boost(), closeTo(5.0, 0.001));
+
+            f = doc.getField("double_field");
+            assertThat((double) f.boost(), closeTo(6.0, 0.001));
+
+            f = doc.getField("float_field");
+            assertThat((double) f.boost(), closeTo(7.0, 0.001));
+
+            f = doc.getField("long_field");
+            assertThat((double) f.boost(), closeTo(8.0, 0.001));
+
+            f = doc.getField("short_field");
+            assertThat((double) f.boost(), closeTo(9.0, 0.001));
+        }
+
+        {
+            DocumentMapper docMapper = createIndex("test2").mapperService().documentMapperParser().parse("person", new CompressedXContent(mapping));
+            BytesReference json = XContentFactory.jsonBuilder().startObject()
+                .field("str_field", "some name")
+                .field("int_field", 10)
+                .field("byte_field", 20)
+                .field("date_field", "2012-01-10")
+                .field("double_field", 30.0)
+                .field("float_field", 40.0)
+                .field("long_field", 50)
+                .field("short_field", 60)
+                .bytes();
+            Document doc = docMapper.parse("test", "person", "1", json).rootDoc();
+
+            IndexableField f = doc.getField("str_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("int_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("byte_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("date_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("double_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("float_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("long_field");
+            assertThat(f.boost(), equalTo(1f));
+
+            f = doc.getField("short_field");
+            assertThat(f.boost(), equalTo(1f));
+        }
+    }
+
     public void testBackCompatInvalidFieldLevelBoost() throws Exception {
         String mapping = XContentFactory.jsonBuilder().startObject().startObject("person").startObject("properties")
                 .startObject("str_field").field("type", "string").endObject()

docs/reference/mapping/fields/all-field.asciidoc

@@ -161,7 +161,7 @@ Individual fields can be included or excluded from the `_all` field with the
 [[all-field-and-boosting]]
 ==== Index boosting and the `_all` field
 
-Individual fields can be _boosted_ at index time, with the <<index-boost,`boost`>>
+Individual fields can be _boosted_ at index time, with the <<mapping-boost,`boost`>>
 parameter. The `_all` field takes these boosts into account:
 
 [source,js]

docs/reference/mapping/params.asciidoc

@@ -8,7 +8,7 @@ parameters that are used by <<mapping-types,field mappings>>:
 The following mapping parameters are common to some or all field datatypes:
 
 * <<analyzer,`analyzer`>>
-* <<index-boost,`boost`>>
+* <<mapping-boost,`boost`>>
 * <<coerce,`coerce`>>
 * <<copy-to,`copy_to`>>
 * <<doc-values,`doc_values`>>

docs/reference/mapping/params/boost.asciidoc

@@ -1,8 +1,8 @@
-[[index-boost]]
+[[mapping-boost]]
 === `boost`
 
-Individual fields can be _boosted_ -- count more towards the relevance score
--- at index time, with the `boost` parameter as follows:
+Individual fields can be _boosted_ automatically -- count more towards the relevance score
+-- at query time, with the `boost` parameter as follows:
 
 [source,js]
 --------------------------------------------------
@@ -28,10 +28,45 @@ PUT my_index
 <1> Matches on the `title` field will have twice the weight as those on the
     `content` field, which has the default `boost` of `1.0`.
 
-Note that a `title` field will usually be shorter than a `content` field.  The
-default relevance calculation takes field length into account, so a short
-`title` field will have a higher natural boost than a long `content` field.
+NOTE: The boost is applied only for term queries (prefix, range and fuzzy queries are not _boosted_).
 
+You can achieve the same effect by using the boost parameter directly in the query, for instance the following query (with field time boost):
+
+[source,js]
+--------------------------------------------------
+{
+    "match" : {
+        "title": {
+            "query": "quick brown fox"
+        }
+    }
+}
+--------------------------------------------------
+
+is equivalent to:
+
+[source,js]
+--------------------------------------------------
+{
+    "match" : {
+        "title": {
+            "query": "quick brown fox",
+            "boost": 2
+        }
+    }
+}
+--------------------------------------------------
+// AUTOSENSE
+
+
+The boost is also applied when it is copied with the
+value in the <<mapping-all-field,`_all`>> field. This means that, when
+querying the `_all` field, words that originated from the `title` field will
+have a higher score than words that originated in the `content` field.
+This functionality comes at a cost: queries on the `_all` field are slower
+when field boosting is used.
+
+deprecated[5.0.0, index time boost is deprecated.  Instead, the field mapping boost is applied at query time. For indices created before 5.0.0 the boost will still be applied at index time.]
 [WARNING]
 .Why index time boosting is a bad idea
 ==================================================
@@ -48,12 +83,4 @@ We advise against using index time boosting for the following reasons:
   byte.  This reduces the resolution of the field length normalization factor
   which can lead to lower quality relevance calculations.
 
-==================================================
-
-The only advantage that index time boosting has is that it is copied with the
-value into the <<mapping-all-field,`_all`>> field. This means that, when
-querying the `_all` field, words that originated from the `title` field will
-have a higher score than words that originated in the `content` field.
-This functionality comes at a cost: queries on the `_all` field are slower
-when index-time boosting is used.
-
+==================================================

docs/reference/mapping/params/norms.asciidoc

@@ -1,10 +1,8 @@
 [[norms]]
 === `norms`
 
-Norms store various normalization factors -- a number to represent the
-relative field length and the <<index-boost,index time `boost`>> setting --
-that are later used at query time in order to compute the score of a document
-relatively to a query.
+Norms store various normalization factors that are later used at query time
+in order to compute the score of a document relatively to a query.
 
 Although useful for scoring, norms also require quite a lot of memory
 (typically in the order of one byte per document per field in your index, even

docs/reference/mapping/types/boolean.asciidoc

@@ -91,9 +91,9 @@ The following parameters are accepted by `boolean` fields:
 
 [horizontal]
 
-<<index-boost,`boost`>>::
+<<mapping-boost,`boost`>>::
 
-    Field-level index time boosting. Accepts a floating point number, defaults
+    Mapping field-level query time boosting. Accepts a floating point number, defaults
     to `1.0`.
 
 <<doc-values,`doc_values`>>::

docs/reference/mapping/types/date.asciidoc

@@ -90,9 +90,9 @@ The following parameters are accepted by `date` fields:
 
 [horizontal]
 
-<<index-boost,`boost`>>::
+<<mapping-boost,`boost`>>::
 
-    Field-level index time boosting. Accepts a floating point number, defaults
+    Mapping field-level query time boosting. Accepts a floating point number, defaults
     to `1.0`.
 
 <<doc-values,`doc_values`>>::

docs/reference/mapping/types/ip.asciidoc

@@ -47,9 +47,9 @@ The following parameters are accepted by `ip` fields:
 
 [horizontal]
 
-<<index-boost,`boost`>>::
+<<mapping-boost,`boost`>>::
 
-    Field-level index time boosting. Accepts a floating point number, defaults
+    Mapping field-level query time boosting. Accepts a floating point number, defaults
     to `1.0`.
 
 <<doc-values,`doc_values`>>::

docs/reference/mapping/types/numeric.asciidoc

@@ -45,9 +45,9 @@ The following parameters are accepted by numeric types:
     Try to convert strings to numbers and truncate fractions for integers.
     Accepts `true` (default) and `false`.
 
-<<index-boost,`boost`>>::
+<<mapping-boost,`boost`>>::
 
-    Field-level index time boosting. Accepts a floating point number, defaults
+    Mapping field-level query time boosting. Accepts a floating point number, defaults
     to `1.0`.
 
 <<doc-values,`doc_values`>>::

docs/reference/mapping/types/string.asciidoc

@@ -75,9 +75,9 @@ The following parameters are accepted by `string` fields:
     Defaults to the default index analyzer, or the
     <<analysis-standard-analyzer,`standard` analyzer>>.
 
-<<index-boost,`boost`>>::
+<<mapping-boost,`boost`>>::
 
-    Field-level index time boosting. Accepts a floating point number, defaults
+    Mapping field-level query time boosting. Accepts a floating point number, defaults
     to `1.0`.
 
 <<doc-values,`doc_values`>>::

docs/reference/mapping/types/token-count.asciidoc

@@ -68,9 +68,9 @@ The following parameters are accepted by `token_count` fields:
     value. Required. For best performance, use an analyzer without token
     filters.
 
-<<index-boost,`boost`>>::
+<<mapping-boost,`boost`>>::
 
-    Field-level index time boosting. Accepts a floating point number, defaults
+    Mapping field-level query time boosting. Accepts a floating point number, defaults
     to `1.0`.
 
 <<doc-values,`doc_values`>>::

docs/reference/redirects.asciidoc

@@ -449,3 +449,8 @@ The docs for the `nested` field datatype have moved to <<nested>>.
 
 Warmers have been removed. There have been significant improvements to the
 index that make warmers not necessary anymore.
+
+[role="exclude",id="index-boost"]
+=== Index time boosting
+
+The index time boost mapping has been replaced with query time boost (see <<mapping-boost>>).

docs/reference/search/request-body.asciidoc

@@ -165,7 +165,7 @@ include::request/explain.asciidoc[]
 
 include::request/version.asciidoc[]
 
-include::request/index-boost.asciidoc[]
+include::request/mapping-boost.asciidoc[]
 
 include::request/min-score.asciidoc[]