Fix search_as_you_type field with term_vector (#66432)

This commit fixes a bug in the search_as_you_type field that was introduced during
the refactoring of the field mapper. The prefix field that is used internally
by the search_as_you_type mapper doesn't need term vector even if they are activated
on the main field. So this commit ensures that we don't copy the options from the main
field when we create the prefix sub-field.

Closes #66407

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

@@ -166,8 +166,8 @@ public SearchAsYouTypeFieldMapper build(ContentPath contentPath) {
             indexAnalyzers.put(ft.name(), indexAnalyzer);
 
             // set up the prefix field
-            FieldType prefixft = new FieldType(fieldType);
-            prefixft.setStoreTermVectors(false);
+            FieldType prefixft = new FieldType();
+            prefixft.setIndexOptions(fieldType.indexOptions());
             prefixft.setOmitNorms(true);
             prefixft.setStored(false);
             final String fullName = buildFullName(contentPath);
@@ -179,10 +179,8 @@ public SearchAsYouTypeFieldMapper build(ContentPath contentPath) {
                 SearchAsYouTypeAnalyzer.withShingle(searchAnalyzer.analyzer(), maxShingleSize.getValue()));
             // don't wrap the root field's search quote analyzer as prefix field doesn't support phrase queries
             TextSearchInfo prefixSearchInfo = new TextSearchInfo(prefixft, similarity.getValue(), prefixSearchWrapper, searchAnalyzer);
-            final PrefixFieldType prefixFieldType
-                = new PrefixFieldType(fullName, prefixSearchInfo, Defaults.MIN_GRAM, Defaults.MAX_GRAM);
-            final NamedAnalyzer prefixAnalyzer
-                = new NamedAnalyzer(indexAnalyzer.name(), AnalyzerScope.INDEX, prefixIndexWrapper);
+            final PrefixFieldType prefixFieldType = new PrefixFieldType(fullName, prefixSearchInfo, Defaults.MIN_GRAM, Defaults.MAX_GRAM);
+            final NamedAnalyzer prefixAnalyzer = new NamedAnalyzer(indexAnalyzer.name(), AnalyzerScope.INDEX, prefixIndexWrapper);
             final PrefixFieldMapper prefixFieldMapper = new PrefixFieldMapper(prefixft, prefixFieldType);
             indexAnalyzers.put(prefixFieldType.name(), prefixAnalyzer);
 
@@ -206,8 +204,7 @@ public SearchAsYouTypeFieldMapper build(ContentPath contentPath) {
                 final ShingleFieldType shingleFieldType = new ShingleFieldType(fieldName, shingleSize, textSearchInfo);
                 shingleFieldType.setPrefixFieldType(prefixFieldType);
                 shingleFieldTypes[i] = shingleFieldType;
-                NamedAnalyzer shingleAnalyzer
-                    = new NamedAnalyzer(indexAnalyzer.name(), AnalyzerScope.INDEX, shingleIndexWrapper);
+                NamedAnalyzer shingleAnalyzer = new NamedAnalyzer(indexAnalyzer.name(), AnalyzerScope.INDEX, shingleIndexWrapper);
                 shingleFieldMappers[i] = new ShingleFieldMapper(shingleft, shingleFieldType);
                 indexAnalyzers.put(shingleFieldType.name(), shingleAnalyzer);
             }

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

@@ -332,18 +332,48 @@ public void testStoredOnly() throws IOException {
     }
 
     public void testTermVectors() throws IOException {
-        DocumentMapper mapper = createDocumentMapper(fieldMapping(b -> b.field("type", "search_as_you_type").field("term_vector", "yes")));
-        ParsedDocument doc = mapper.parse(source(b -> b.field("field", "some text")));
+        for (String termVector :  new String[] { "yes", "with_positions", "with_offsets", "with_positions_offsets",
+                "with_positions_payloads", "with_positions_offsets_payloads"}) {
+            DocumentMapper mapper = createDocumentMapper(fieldMapping(b -> b.field("type", "search_as_you_type")
+                .field("term_vector", termVector)));
+            ParsedDocument doc = mapper.parse(source(b -> b.field("field", "some text")));
 
-        assertTrue(fieldType(doc, "field").storeTermVectors());
+            IndexableFieldType rootField = fieldType(doc, "field");
+            assertTrue(rootField.storeTermVectors());
+            if (termVector.contains("positions")) {
+                assertThat(rootField.storeTermVectorPositions(), equalTo(termVector.contains("positions")));
+            }
+            if (termVector.contains("offsets")) {
+                assertTrue(rootField.storeTermVectorOffsets());
+                assertThat(rootField.storeTermVectorOffsets(), equalTo(termVector.contains("offsets")));
+            }
+            if (termVector.contains("payloads")) {
+                assertTrue(rootField.storeTermVectorPayloads());
+                assertThat(rootField.storeTermVectorPayloads(), equalTo(termVector.contains("payloads")));
+            }
 
-        Stream.of(
-            fieldType(doc, "field._2gram"),
-            fieldType(doc, "field._3gram")
-        ).forEach(ft -> assertTrue(ft.storeTermVectors()));
+            Stream.of(
+                fieldType(doc, "field._2gram"),
+                fieldType(doc, "field._3gram")
+            ).forEach(ft -> {
+                assertTrue(ft.storeTermVectors());
+                if (termVector.contains("positions")) {
+                    assertThat(ft.storeTermVectorPositions(), equalTo(termVector.contains("positions")));
+                }
+                if (termVector.contains("offsets")) {
+                    assertThat(ft.storeTermVectorOffsets(), equalTo(termVector.contains("offsets")));
+                }
+                if (termVector.contains("payloads")) {
+                    assertThat(ft.storeTermVectorPayloads(), equalTo(termVector.contains("payloads")));
+                }
+            });
 
-        PrefixFieldMapper prefixFieldMapper = getPrefixFieldMapper(mapper, "field._index_prefix");
-        assertFalse(prefixFieldMapper.fieldType.storeTermVectors());
+            PrefixFieldMapper prefixFieldMapper = getPrefixFieldMapper(mapper, "field._index_prefix");
+            assertFalse(prefixFieldMapper.fieldType.storeTermVectors());
+            assertFalse(prefixFieldMapper.fieldType.storeTermVectorOffsets());
+            assertFalse(prefixFieldMapper.fieldType.storeTermVectorPositions());
+            assertFalse(prefixFieldMapper.fieldType.storeTermVectorPayloads());
+        }
     }
 
     public void testNorms() throws IOException {