semantic_text field mapping

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

@@ -696,6 +696,10 @@ private static void failIfMatchesRoutingPath(DocumentParserContext context, Stri
      */
     private static void parseCopyFields(DocumentParserContext context, List<String> copyToFields) throws IOException {
         for (String field : copyToFields) {
+            if (context.mappingLookup().getMapper(field) instanceof InferenceFieldMapper) {
+                // ignore copy_to that targets inference fields, values are already extracted in the coordinating node to perform inference.
+                continue;
+            }
             // In case of a hierarchy of nested documents, we need to figure out
             // which document the field should go to
             LuceneDocument targetDoc = null;

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

@@ -1199,7 +1199,7 @@ public static final class Conflicts {
         private final String mapperName;
         private final List<String> conflicts = new ArrayList<>();
 
-        Conflicts(String mapperName) {
+        public Conflicts(String mapperName) {
             this.mapperName = mapperName;
         }
 
@@ -1211,7 +1211,7 @@ void addConflict(String parameter, String existing, String toMerge) {
             conflicts.add("Cannot update parameter [" + parameter + "] from [" + existing + "] to [" + toMerge + "]");
         }
 
-        void check() {
+        public void check() {
             if (conflicts.isEmpty()) {
                 return;
             }

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

@@ -55,7 +55,7 @@ public static MapperMergeContext from(MapperBuilderContext mapperBuilderContext,
      * @param name the name of the child context
      * @return a new {@link MapperMergeContext} with this context as its parent
      */
-    MapperMergeContext createChildContext(String name, ObjectMapper.Dynamic dynamic) {
+    public MapperMergeContext createChildContext(String name, ObjectMapper.Dynamic dynamic) {
         return createChildContext(mapperBuilderContext.createChildContext(name, dynamic));
     }
 
@@ -69,7 +69,7 @@ MapperMergeContext createChildContext(MapperBuilderContext childContext) {
         return new MapperMergeContext(childContext, newFieldsBudget);
     }
 
-    MapperBuilderContext getMapperBuilderContext() {
+    public MapperBuilderContext getMapperBuilderContext() {
         return mapperBuilderContext;
     }
 

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

@@ -76,7 +76,7 @@ public CompressedXContent toCompressedXContent() {
     /**
      * Returns the root object for the current mapping
      */
-    RootObjectMapper getRoot() {
+    public RootObjectMapper getRoot() {
         return root;
     }
 

server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java

@@ -230,6 +230,16 @@ protected Parameter<?>[] getParameters() {
             return new Parameter<?>[] { elementType, dims, indexed, similarity, indexOptions, meta };
         }
 
+        public Builder similarity(VectorSimilarity vectorSimilarity) {
+            similarity.setValue(vectorSimilarity);
+            return this;
+        }
+
+        public Builder dimensions(int dimensions) {
+            this.dims.setValue(dimensions);
+            return this;
+        }
+
         @Override
         public DenseVectorFieldMapper build(MapperBuilderContext context) {
             return new DenseVectorFieldMapper(
@@ -754,7 +764,7 @@ public static ElementType fromString(String name) {
         ElementType.FLOAT
     );
 
-    enum VectorSimilarity {
+    public enum VectorSimilarity {
         L2_NORM {
             @Override
             float score(float similarity, ElementType elementType, int dim) {

server/src/test/java/org/elasticsearch/index/mapper/CopyToMapperTests.java

@@ -22,6 +22,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import static org.elasticsearch.xcontent.XContentFactory.jsonBuilder;
 import static org.hamcrest.Matchers.equalTo;
@@ -106,6 +107,12 @@ public void testCopyToFieldsParsing() throws Exception {
 
         fieldMapper = mapperService.documentMapper().mappers().getMapper("new_field");
         assertThat(fieldMapper.typeName(), equalTo("long"));
+
+        MappingLookup mappingLookup = mapperService.mappingLookup();
+        assertThat(mappingLookup.sourcePaths("another_field"), equalTo(Set.of("copy_test", "int_to_str_test", "another_field")));
+        assertThat(mappingLookup.sourcePaths("new_field"), equalTo(Set.of("new_field", "int_to_str_test")));
+        assertThat(mappingLookup.sourcePaths("copy_test"), equalTo(Set.of("copy_test", "cyclic_test")));
+        assertThat(mappingLookup.sourcePaths("cyclic_test"), equalTo(Set.of("cyclic_test", "copy_test")));
     }
 
     public void testCopyToFieldsInnerObjectParsing() throws Exception {

server/src/test/java/org/elasticsearch/index/mapper/MultiFieldTests.java

@@ -224,6 +224,9 @@ public void testSourcePathFields() throws IOException {
         final Set<String> fieldsUsingSourcePath = new HashSet<>();
         ((FieldMapper) mapper).sourcePathUsedBy().forEachRemaining(mapper1 -> fieldsUsingSourcePath.add(mapper1.name()));
         assertThat(fieldsUsingSourcePath, equalTo(Set.of("field.subfield1", "field.subfield2")));
+
+        assertThat(mapperService.mappingLookup().sourcePaths("field.subfield1"), equalTo(Set.of("field")));
+        assertThat(mapperService.mappingLookup().sourcePaths("field.subfield2"), equalTo(Set.of("field")));
     }
 
     public void testUnknownLegacyFieldsUnderKnownRootField() throws Exception {

test/framework/src/main/java/org/elasticsearch/cluster/metadata/DataStreamTestHelper.java

@@ -639,7 +639,7 @@ public static MetadataRolloverService getMetadataRolloverService(
         AllocationService allocationService = mock(AllocationService.class);
         when(allocationService.reroute(any(ClusterState.class), any(String.class), any())).then(i -> i.getArguments()[0]);
         when(allocationService.getShardRoutingRoleStrategy()).thenReturn(TestShardRoutingRoleStrategies.DEFAULT_ROLE_ONLY);
-        MappingLookup mappingLookup = null;
+        MappingLookup mappingLookup = MappingLookup.EMPTY;
         if (dataStream != null) {
             RootObjectMapper.Builder root = new RootObjectMapper.Builder("_doc", ObjectMapper.Defaults.SUBOBJECTS);
             root.add(
@@ -718,6 +718,7 @@ public static IndicesService mockIndicesServices(MappingLookup mappingLookup) th
             when(documentMapper.mapping()).thenReturn(mapping);
             when(documentMapper.mappers()).thenReturn(MappingLookup.EMPTY);
             when(documentMapper.mappingSource()).thenReturn(mapping.toCompressedXContent());
+            when(documentMapper.mappers()).thenReturn(mappingLookup);
             RoutingFieldMapper routingFieldMapper = mock(RoutingFieldMapper.class);
             when(routingFieldMapper.required()).thenReturn(false);
             when(documentMapper.routingFieldMapper()).thenReturn(routingFieldMapper);

test/framework/src/main/java/org/elasticsearch/index/mapper/MapperTestCase.java

@@ -1030,7 +1030,7 @@ public final void testMinimalIsInvalidInRoutingPath() throws IOException {
         }
     }
 
-    private String minimalIsInvalidRoutingPathErrorMessage(Mapper mapper) {
+    protected String minimalIsInvalidRoutingPathErrorMessage(Mapper mapper) {
         if (mapper instanceof FieldMapper fieldMapper && fieldMapper.fieldType().isDimension() == false) {
             return "All fields that match routing_path must be configured with [time_series_dimension: true] "
                 + "or flattened fields with a list of dimensions in [time_series_dimensions] and "

x-pack/plugin/inference/build.gradle

@@ -6,6 +6,13 @@
  */
 apply plugin: 'elasticsearch.internal-es-plugin'
 apply plugin: 'elasticsearch.internal-cluster-test'
+apply plugin: 'elasticsearch.internal-yaml-rest-test'
+
+restResources {
+  restApi {
+    include '_common', 'indices', 'inference', 'index'
+  }
+}
 
 esplugin {
   name 'x-pack-inference'
@@ -24,6 +31,11 @@ dependencies {
   compileOnly project(path: xpackModule('core'))
   testImplementation(testArtifact(project(xpackModule('core'))))
   testImplementation project(':modules:reindex')
+  clusterPlugins project(':x-pack:plugin:inference:qa:test-service-plugin')
 
   api "com.ibm.icu:icu4j:${versions.icu4j}"
 }
+
+tasks.named('yamlRestTest') {
+  usesDefaultDistribution()
+}

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferencePlugin.java

@@ -21,11 +21,13 @@
 import org.elasticsearch.core.IOUtils;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.features.NodeFeature;
+import org.elasticsearch.index.mapper.Mapper;
 import org.elasticsearch.indices.SystemIndexDescriptor;
 import org.elasticsearch.inference.InferenceServiceExtension;
 import org.elasticsearch.inference.InferenceServiceRegistry;
 import org.elasticsearch.plugins.ActionPlugin;
 import org.elasticsearch.plugins.ExtensiblePlugin;
+import org.elasticsearch.plugins.MapperPlugin;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.plugins.SystemIndexPlugin;
 import org.elasticsearch.rest.RestController;
@@ -50,6 +52,7 @@
 import org.elasticsearch.xpack.inference.external.http.sender.HttpRequestSender;
 import org.elasticsearch.xpack.inference.external.http.sender.RequestExecutorServiceSettings;
 import org.elasticsearch.xpack.inference.logging.ThrottlerManager;
+import org.elasticsearch.xpack.inference.mapper.SemanticTextFieldMapper;
 import org.elasticsearch.xpack.inference.registry.ModelRegistry;
 import org.elasticsearch.xpack.inference.rest.RestDeleteInferenceModelAction;
 import org.elasticsearch.xpack.inference.rest.RestGetInferenceModelAction;
@@ -67,12 +70,13 @@
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.Map;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-public class InferencePlugin extends Plugin implements ActionPlugin, ExtensiblePlugin, SystemIndexPlugin {
+public class InferencePlugin extends Plugin implements ActionPlugin, ExtensiblePlugin, SystemIndexPlugin, MapperPlugin {
 
     /**
      * When this setting is true the verification check that
@@ -260,4 +264,12 @@ public void close() {
 
         IOUtils.closeWhileHandlingException(inferenceServiceRegistry.get(), throttlerToClose);
     }
+
+    @Override
+    public Map<String, Mapper.TypeParser> getMappers() {
+        if (SemanticTextFeature.isEnabled()) {
+            return Map.of(SemanticTextFieldMapper.CONTENT_TYPE, SemanticTextFieldMapper.PARSER);
+        }
+        return Map.of();
+    }
 }

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/SemanticTextFeature.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.inference;
+
+import org.elasticsearch.common.util.FeatureFlag;
+
+/**
+ * semantic_text feature flag. When the feature is complete, this flag will be removed.
+ */
+public class SemanticTextFeature {
+
+    private SemanticTextFeature() {}
+
+    private static final FeatureFlag FEATURE_FLAG = new FeatureFlag("semantic_text");
+
+    public static boolean isEnabled() {
+        return FEATURE_FLAG.isEnabled();
+    }
+}