Hide new test behind a feature (elastic#112301)

Author: lkts

muted-tests.yml

@@ -160,9 +160,6 @@ tests:
 - class: org.elasticsearch.xpack.ml.integration.MlJobIT
   method: testDeleteJobAsync
   issue: https://github.com/elastic/elasticsearch/issues/112212
-- class: org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT
-  method: test {p0=indices.create/20_synthetic_source/stored field under object with store_array_source}
-  issue: https://github.com/elastic/elasticsearch/issues/112264
 - class: org.elasticsearch.search.query.ScriptScoreQueryTests
   method: testScriptTermStatsAvailable
   issue: https://github.com/elastic/elasticsearch/issues/112278

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/indices.create/20_synthetic_source.yml

@@ -1342,8 +1342,8 @@ subobjects auto:
 # 112156
 stored field under object with store_array_source:
   - requires:
-      cluster_features: ["mapper.track_ignored_source"]
-      reason: requires tracking ignored source
+      cluster_features: ["mapper.source.synthetic_source_stored_fields_advance_fix"]
+      reason: requires bug fix to be implemented
 
   - do:
       indices.create:

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

@@ -32,7 +32,8 @@ public Set<NodeFeature> getFeatures() {
             IndexModeFieldMapper.QUERYING_INDEX_MODE,
             NodeMappingStats.SEGMENT_LEVEL_FIELDS_STATS,
             BooleanFieldMapper.BOOLEAN_DIMENSION,
-            ObjectMapper.SUBOBJECTS_AUTO
+            ObjectMapper.SUBOBJECTS_AUTO,
+            SourceFieldMapper.SYNTHETIC_SOURCE_STORED_FIELDS_ADVANCE_FIX
         );
     }
 }

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

@@ -38,6 +38,9 @@
 
 public class SourceFieldMapper extends MetadataFieldMapper {
     public static final NodeFeature SYNTHETIC_SOURCE_FALLBACK = new NodeFeature("mapper.source.synthetic_source_fallback");
+    public static final NodeFeature SYNTHETIC_SOURCE_STORED_FIELDS_ADVANCE_FIX = new NodeFeature(
+        "mapper.source.synthetic_source_stored_fields_advance_fix"
+    );
 
     public static final String NAME = "_source";
     public static final String RECOVERY_SOURCE_NAME = "_recovery_source";