Semantic_text match_all with Highlighter (#128702) (#128922)

* initial implementation for match_All

* reformat

* [CI] Auto commit changes from spotless

* Excluding matchAllintercepter

* Adding matchAllDocs support for vector fields

* [CI] Auto commit changes from spotless

* Remove previous implementation

* Adding yaml tests for match_all

* fixed yaml tests

* Update docs/changelog/128702.yaml

* Update changelog

* changelog - update summary

* Fix wrong inference names for the yaml tests

---------

Co-authored-by: elasticsearchmachine <infra-root+elasticsearchmachine@elastic.co>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
(cherry picked from commit d1b5532)

# Conflicts:
#	x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferenceFeatures.java
#	x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/90_semantic_text_highlighter.yml
#	x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/90_semantic_text_highlighter_bwc.yml

Author: Samiul-TheSoccerFan

docs/changelog/128702.yaml

@@ -0,0 +1,5 @@
+pr: 128702
+summary: Fix missing highlighting in `match_all` queries for `semantic_text` fields
+area: Search
+type: bug
+issues: []

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

@@ -27,6 +27,7 @@ public class InferenceFeatures implements FeatureSpecification {
 
     private static final NodeFeature SEMANTIC_TEXT_HIGHLIGHTER = new NodeFeature("semantic_text.highlighter");
     private static final NodeFeature SEMANTIC_TEXT_HIGHLIGHTER_DEFAULT = new NodeFeature("semantic_text.highlighter.default");
+    private static final NodeFeature SEMANTIC_TEXT_MATCH_ALL_HIGHLIGHTER = new NodeFeature("semantic_text.match_all_highlighter");
 
     @Override
     public Set<NodeFeature> getTestFeatures() {
@@ -45,7 +46,8 @@ public Set<NodeFeature> getTestFeatures() {
             TextSimilarityRankRetrieverBuilder.TEXT_SIMILARITY_RERANKER_ALIAS_HANDLING_FIX,
             SemanticInferenceMetadataFieldsMapper.INFERENCE_METADATA_FIELDS_ENABLED_BY_DEFAULT,
             SEMANTIC_TEXT_HIGHLIGHTER_DEFAULT,
-            SEMANTIC_KNN_FILTER_FIX
+            SEMANTIC_KNN_FILTER_FIX,
+            SEMANTIC_TEXT_MATCH_ALL_HIGHLIGHTER
         );
     }
 }

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

@@ -15,6 +15,7 @@
 import org.apache.lucene.search.IndexSearcher;
 import org.apache.lucene.search.KnnByteVectorQuery;
 import org.apache.lucene.search.KnnFloatVectorQuery;
+import org.apache.lucene.search.MatchAllDocsQuery;
 import org.apache.lucene.search.Query;
 import org.apache.lucene.search.QueryVisitor;
 import org.apache.lucene.search.ScoreMode;
@@ -267,6 +268,8 @@ public void visitLeaf(Query query) {
                     queries.add(fieldType.createExactKnnQuery(VectorData.fromFloats(knnQuery.getTargetCopy()), null));
                 } else if (query instanceof KnnByteVectorQuery knnQuery) {
                     queries.add(fieldType.createExactKnnQuery(VectorData.fromBytes(knnQuery.getTargetCopy()), null));
+                } else if (query instanceof MatchAllDocsQuery) {
+                    queries.add(new MatchAllDocsQuery());
                 }
             }
         });
@@ -293,6 +296,13 @@ public QueryVisitor getSubVisitor(BooleanClause.Occur occur, Query parent) {
                 }
                 return this;
             }
+
+            @Override
+            public void visitLeaf(Query query) {
+                if (query instanceof MatchAllDocsQuery) {
+                    queries.add(new MatchAllDocsQuery());
+                }
+            }
         });
         return queries;
     }

x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/90_semantic_text_highlighter.yml

@@ -291,3 +291,44 @@ setup:
   - match:      { hits.hits.0._id: "doc_1" }
   - not_exists: hits.hits.0.highlight.title
 
+---
+"Highlighting with match_all query":
+  - requires:
+      cluster_features: "semantic_text.match_all_highlighter"
+      reason: semantic text field supports match_all query with semantic highlighter.
+
+  - do:
+      search:
+        index: test-sparse-index
+        body:
+          query:
+            match_all: {}
+          highlight:
+            fields:
+              body:
+                type: "semantic"
+                number_of_fragments: 2
+
+  - match:  { hits.total.value: 1 }
+  - match:  { hits.hits.0._id: "doc_1" }
+  - length: { hits.hits.0.highlight.body: 2 }
+  - match:  { hits.hits.0.highlight.body.0: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
+  - match:  { hits.hits.0.highlight.body.1: "You Know, for Search!" }
+
+  - do:
+      search:
+        index: test-dense-index
+        body:
+          query:
+            match_all: {}
+          highlight:
+            fields:
+              body:
+                type: "semantic"
+                number_of_fragments: 2
+
+  - match: { hits.total.value: 1 }
+  - match: { hits.hits.0._id: "doc_1" }
+  - length: { hits.hits.0.highlight.body: 2 }
+  - match: { hits.hits.0.highlight.body.0: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
+  - match: { hits.hits.0.highlight.body.1: "You Know, for Search!" }

x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/90_semantic_text_highlighter_bwc.yml

@@ -243,4 +243,60 @@ setup:
   - match:  { hits.hits.0.highlight.body.0: "You Know, for Search!" }
   - match:  { hits.hits.0.highlight.body.1: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
 
+---
+"Highlighting with match_all query":
+  - requires:
+      cluster_features: "semantic_text.match_all_highlighter"
+      reason: semantic text field supports match_all query with semantic highlighter
 
+  - do:
+      index:
+        index: test-sparse-index
+        id: doc_1
+        body:
+          body: [ "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides.", "You Know, for Search!" ]
+        refresh: true
+
+  - do:
+      search:
+        index: test-sparse-index
+        body:
+          query:
+            match_all: {}
+          highlight:
+            fields:
+              body:
+                type: "semantic"
+                number_of_fragments: 2
+
+  - match:  { hits.total.value: 1 }
+  - match:  { hits.hits.0._id: "doc_1" }
+  - length: { hits.hits.0.highlight.body: 2 }
+  - match:  { hits.hits.0.highlight.body.0: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
+  - match:  { hits.hits.0.highlight.body.1: "You Know, for Search!" }
+
+  - do:
+      index:
+        index: test-dense-index
+        id: doc_1
+        body:
+          body: [ "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides.", "You Know, for Search!" ]
+        refresh: true
+
+  - do:
+      search:
+        index: test-dense-index
+        body:
+          query:
+            match_all: {}
+          highlight:
+            fields:
+              body:
+                type: "semantic"
+                number_of_fragments: 2
+
+  - match: { hits.total.value: 1 }
+  - match: { hits.hits.0._id: "doc_1" }
+  - length: { hits.hits.0.highlight.body: 2 }
+  - match: { hits.hits.0.highlight.body.0: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
+  - match: { hits.hits.0.highlight.body.1: "You Know, for Search!" }