Allow metadata fields in the _source

modules/mapper-extras/src/main/java/org/elasticsearch/index/mapper/RankFeatureMetaFieldMapper.java

@@ -65,17 +65,6 @@ private RankFeatureMetaFieldMapper() {
         super(RankFeatureMetaFieldType.INSTANCE);
     }
 
-    @Override
-    public void preParse(ParseContext context) {}
-
-    @Override
-    protected void parseCreateField(ParseContext context) {
-        throw new AssertionError("Should never be called");
-    }
-
-    @Override
-    public void postParse(ParseContext context) {}
-
     @Override
     protected String contentType() {
         return CONTENT_TYPE;

modules/mapper-extras/src/test/java/org/elasticsearch/index/mapper/RankFeatureMetaFieldMapperTests.java

@@ -69,6 +69,7 @@ public void testDocumentParsingFailsOnMetaField() throws Exception {
         BytesReference bytes = BytesReference.bytes(XContentFactory.jsonBuilder().startObject().field(rfMetaField, 0).endObject());
         MapperParsingException e = expectThrows(MapperParsingException.class, () ->
             mapper.parse(new SourceToParse("test", "1", bytes, XContentType.JSON)));
-        assertTrue(e.getMessage().contains("Field ["+ rfMetaField + "] is a metadata field and cannot be added inside a document."));
+        assertTrue(
+            e.getCause().getMessage().contains("Field ["+ rfMetaField + "] is a metadata field and cannot be added inside a document."));
     }
 }

plugins/mapper-size/src/main/java/org/elasticsearch/index/mapper/size/SizeFieldMapper.java

@@ -79,23 +79,9 @@ public boolean enabled() {
         return this.enabled.value();
     }
 
-    @Override
-    public void preParse(ParseContext context) {
-    }
-
     @Override
     public void postParse(ParseContext context) throws IOException {
         // we post parse it so we get the size stored, possibly compressed (source will be preParse)
-        super.parse(context);
-    }
-
-    @Override
-    public void parse(ParseContext context) {
-        // nothing to do here, we call the parent in postParse
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) {
         if (enabled.value() == false) {
             return;
         }

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

@@ -391,10 +391,7 @@ private static void innerParseObject(ParseContext context, ObjectMapper mapper,
             if (token == XContentParser.Token.FIELD_NAME) {
                 currentFieldName = parser.currentName();
                 paths = splitAndValidatePath(currentFieldName);
-                if (context.mapperService().isMetadataField(context.path().pathAsText(currentFieldName))) {
-                    throw new MapperParsingException("Field [" + currentFieldName + "] is a metadata field and cannot be added inside"
-                        + " a document. Use the index API request parameters.");
-                } else if (containsDisabledObjectMapper(mapper, paths)) {
+                if (containsDisabledObjectMapper(mapper, paths)) {
                     parser.nextToken();
                     parser.skipChildren();
                 }
@@ -482,7 +479,7 @@ private static void parseObject(final ParseContext context, ObjectMapper mapper,
                                     String[] paths) throws IOException {
         assert currentFieldName != null;
 
-        Mapper objectMapper = getMapper(mapper, currentFieldName, paths);
+        Mapper objectMapper = getMapper(context, mapper, currentFieldName, paths);
         if (objectMapper != null) {
             context.path().add(currentFieldName);
             parseObjectOrField(context, objectMapper);
@@ -519,7 +516,7 @@ private static void parseArray(ParseContext context, ObjectMapper parentMapper,
                                    String[] paths) throws IOException {
         String arrayFieldName = lastFieldName;
 
-        Mapper mapper = getMapper(parentMapper, lastFieldName, paths);
+        Mapper mapper = getMapper(context, parentMapper, lastFieldName, paths);
         if (mapper != null) {
             // There is a concrete mapper for this field already. Need to check if the mapper
             // expects an array, if so we pass the context straight to the mapper and if not
@@ -596,7 +593,7 @@ private static void parseValue(final ParseContext context, ObjectMapper parentMa
             throw new MapperParsingException("object mapping [" + parentMapper.name() + "] trying to serialize a value with"
                 + " no field associated with it, current value [" + context.parser().textOrNull() + "]");
         }
-        Mapper mapper = getMapper(parentMapper, currentFieldName, paths);
+        Mapper mapper = getMapper(context, parentMapper, currentFieldName, paths);
         if (mapper != null) {
             parseObjectOrField(context, mapper);
         } else {
@@ -613,7 +610,7 @@ private static void parseValue(final ParseContext context, ObjectMapper parentMa
     private static void parseNullValue(ParseContext context, ObjectMapper parentMapper, String lastFieldName,
                                        String[] paths) throws IOException {
         // we can only handle null values if we have mappings for them
-        Mapper mapper = getMapper(parentMapper, lastFieldName, paths);
+        Mapper mapper = getMapper(context, parentMapper, lastFieldName, paths);
         if (mapper != null) {
             // TODO: passing null to an object seems bogus?
             parseObjectOrField(context, mapper);
@@ -881,9 +878,16 @@ private static ObjectMapper.Dynamic dynamicOrDefault(ObjectMapper parentMapper,
     }
 
     // looks up a child mapper, but takes into account field names that expand to objects
-    private static Mapper getMapper(ObjectMapper objectMapper, String fieldName, String[] subfields) {
+    private static Mapper getMapper(final ParseContext context, ObjectMapper objectMapper, String fieldName, String[] subfields) {
+        String fieldPath = context.path().pathAsText(fieldName);
+        // Check if mapper is a metadata mapper first
+        Mapper mapper = context.docMapper().mapping().getMetadataMapper(fieldPath);
+        if (mapper != null) {
+            return mapper;
+        }
+
         for (int i = 0; i < subfields.length - 1; ++i) {
-            Mapper mapper = objectMapper.getMapper(subfields[i]);
+            mapper = objectMapper.getMapper(subfields[i]);
             if (mapper == null || (mapper instanceof ObjectMapper) == false) {
                 return null;
             }

server/src/main/java/org/elasticsearch/index/mapper/FieldNamesFieldMapper.java

@@ -27,7 +27,6 @@
 import org.elasticsearch.common.logging.DeprecationLogger;
 import org.elasticsearch.index.query.QueryShardContext;
 
-import java.io.IOException;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
@@ -160,19 +159,6 @@ public FieldNamesFieldType fieldType() {
         return (FieldNamesFieldType) super.fieldType();
     }
 
-    @Override
-    public void preParse(ParseContext context) {
-    }
-
-    @Override
-    public void postParse(ParseContext context) {
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
-        // Adding values to the _field_names field is handled by the mappers for each field type
-    }
-
     static Iterable<String> extractFieldNames(final String fullPath) {
         return new Iterable<String>() {
             @Override

server/src/main/java/org/elasticsearch/index/mapper/IdFieldMapper.java

@@ -257,11 +257,6 @@ private IdFieldMapper() {
 
     @Override
     public void preParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
         BytesRef id = Uid.encodeId(context.sourceToParse().id());
         context.doc().add(new Field(NAME, id, Defaults.FIELD_TYPE));
     }

server/src/main/java/org/elasticsearch/index/mapper/IgnoredFieldMapper.java

@@ -82,22 +82,8 @@ private IgnoredFieldMapper() {
         super(IgnoredFieldType.INSTANCE);
     }
 
-    @Override
-    public void preParse(ParseContext context) throws IOException {
-    }
-
     @Override
     public void postParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    public void parse(ParseContext context) throws IOException {
-        // done in post-parse
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
         for (String field : context.getIgnoredFields()) {
             context.doc().add(new Field(NAME, field, Defaults.FIELD_TYPE));
         }

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

@@ -27,7 +27,6 @@
 import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
 import org.elasticsearch.search.lookup.SearchLookup;
 
-import java.io.IOException;
 import java.util.Collections;
 import java.util.function.Supplier;
 
@@ -73,12 +72,6 @@ public IndexFieldMapper() {
         super(IndexFieldType.INSTANCE);
     }
 
-    @Override
-    public void preParse(ParseContext context) throws IOException {}
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {}
-
     @Override
     protected String contentType() {
         return CONTENT_TYPE;

server/src/main/java/org/elasticsearch/index/mapper/Mapping.java

@@ -48,15 +48,18 @@ public final class Mapping implements ToXContentFragment {
     final RootObjectMapper root;
     final MetadataFieldMapper[] metadataMappers;
     final Map<Class<? extends MetadataFieldMapper>, MetadataFieldMapper> metadataMappersMap;
+    final Map<String, MetadataFieldMapper> metadataMappersByName;
     final Map<String, Object> meta;
 
     public Mapping(Version indexCreated, RootObjectMapper rootObjectMapper,
                    MetadataFieldMapper[] metadataMappers, Map<String, Object> meta) {
         this.indexCreated = indexCreated;
         this.metadataMappers = metadataMappers;
         Map<Class<? extends MetadataFieldMapper>, MetadataFieldMapper> metadataMappersMap = new HashMap<>();
+        Map<String, MetadataFieldMapper> metadataMappersByName = new HashMap<>();
         for (MetadataFieldMapper metadataMapper : metadataMappers) {
             metadataMappersMap.put(metadataMapper.getClass(), metadataMapper);
+            metadataMappersByName.put(metadataMapper.name(), metadataMapper);
         }
         this.root = rootObjectMapper;
         // keep root mappers sorted for consistent serialization
@@ -67,6 +70,7 @@ public int compare(Mapper o1, Mapper o2) {
             }
         });
         this.metadataMappersMap = unmodifiableMap(metadataMappersMap);
+        this.metadataMappersByName = unmodifiableMap(metadataMappersByName);
         this.meta = meta;
     }
 
@@ -136,6 +140,10 @@ public Mapping merge(Mapping mergeWith, MergeReason reason) {
         return new Mapping(indexCreated, mergedRoot, mergedMetadataMappers.values().toArray(new MetadataFieldMapper[0]), mergedMeta);
     }
 
+    public MetadataFieldMapper getMetadataMapper(String mapperName) {
+        return metadataMappersByName.get(mapperName);
+    }
+
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         root.toXContent(builder, params, new ToXContent() {

server/src/main/java/org/elasticsearch/index/mapper/MetadataFieldMapper.java

@@ -153,10 +153,18 @@ public final XContentBuilder toXContent(XContentBuilder builder, Params params)
         return builder.endObject();
     }
 
+    @Override
+    protected void parseCreateField(ParseContext context) throws IOException {
+        throw new MapperParsingException("Field [" + name() + "] is a metadata field and cannot be added inside"
+            + " a document. Use the index API request parameters.");
+    }
+
     /**
      * Called before {@link FieldMapper#parse(ParseContext)} on the {@link RootObjectMapper}.
      */
-    public abstract void preParse(ParseContext context) throws IOException;
+    public void preParse(ParseContext context) throws IOException {
+        // do nothing
+    }
 
     /**
      * Called after {@link FieldMapper#parse(ParseContext)} on the {@link RootObjectMapper}.
@@ -169,5 +177,4 @@ public void postParse(ParseContext context) throws IOException {
     public ValueFetcher valueFetcher(MapperService mapperService, SearchLookup lookup, String format) {
         throw new UnsupportedOperationException("Cannot fetch values for internal field [" + name() + "].");
     }
-
 }

server/src/main/java/org/elasticsearch/index/mapper/NestedPathFieldMapper.java

@@ -31,7 +31,6 @@
 import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.query.QueryShardContext;
 
-import java.io.IOException;
 import java.util.Collections;
 
 public class NestedPathFieldMapper extends MetadataFieldMapper {
@@ -93,24 +92,9 @@ private NestedPathFieldMapper(Settings settings) {
         super(new NestedPathFieldType(settings));
     }
 
-    @Override
-    public void preParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    public void parse(ParseContext context) throws IOException {
-        // we parse in pre parse
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
-    }
-
     @Override
     protected String contentType() {
         return NAME;
     }
 
-
 }

server/src/main/java/org/elasticsearch/index/mapper/RoutingFieldMapper.java

@@ -117,18 +117,6 @@ public boolean required() {
 
     @Override
     public void preParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    public void parse(ParseContext context) throws IOException {
-        // no need ot parse here, we either get the routing in the sourceToParse
-        // or we don't have routing, if we get it in sourceToParse, we process it in preParse
-        // which will always be called
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
         String routing = context.sourceToParse().routing();
         if (routing != null) {
             context.doc().add(new Field(fieldType().name(), routing, Defaults.FIELD_TYPE));

server/src/main/java/org/elasticsearch/index/mapper/SeqNoFieldMapper.java

@@ -182,11 +182,6 @@ public SeqNoFieldMapper() {
 
     @Override
     public void preParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
         // see InternalEngine.innerIndex to see where the real version value is set
         // also see ParsedDocument.updateSeqID (called by innerIndex)
         SequenceIDFields seqID = SequenceIDFields.emptySeqID();
@@ -196,11 +191,6 @@ protected void parseCreateField(ParseContext context) throws IOException {
         context.doc().add(seqID.primaryTerm);
     }
 
-    @Override
-    public void parse(ParseContext context) throws IOException {
-        // fields are added in parseCreateField
-    }
-
     @Override
     public void postParse(ParseContext context) throws IOException {
         // In the case of nested docs, let's fill nested docs with the original

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

@@ -156,16 +156,6 @@ public boolean isComplete() {
 
     @Override
     public void preParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    public void parse(ParseContext context) throws IOException {
-        // nothing to do here, we will call it in pre parse
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
         BytesReference originalSource = context.sourceToParse().source();
         XContentType contentType = context.sourceToParse().getXContentType();
         final BytesReference adaptedSource = applyFilters(originalSource, contentType);

server/src/main/java/org/elasticsearch/index/mapper/TypeFieldMapper.java

@@ -168,21 +168,6 @@ private TypeFieldMapper() {
         super(new TypeFieldType());
     }
 
-    @Override
-    public void preParse(ParseContext context) throws IOException {
-        super.parse(context);
-    }
-
-    @Override
-    public void parse(ParseContext context) throws IOException {
-        // we parse in pre parse
-    }
-
-    @Override
-    protected void parseCreateField(ParseContext context) throws IOException {
-
-    }
-
     @Override
     protected String contentType() {
         return CONTENT_TYPE;