Add cluster feature

Author: jordan-powers

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/tsdb/160_nested_fields.yml

@@ -1,3 +1,8 @@
+setup:
+  - requires:
+      cluster_features: ["mapper.tsdb_nested_field_support"]
+      reason: "tsdb index with nested field support enabled"
+
 ---
 "Create TSDB index with field of nested type":
   - do:

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

@@ -27,6 +27,7 @@ public class MapperFeatures implements FeatureSpecification {
         "mapper.counted_keyword.synthetic_source_native_support"
     );
 
+    public static final NodeFeature TSDB_NESTED_FIELD_SUPPORT = new NodeFeature("mapper.tsdb_nested_field_support");
     public static final NodeFeature META_FETCH_FIELDS_ERROR_CODE_CHANGED = new NodeFeature("meta_fetch_fields_error_code_changed");
     public static final NodeFeature SPARSE_VECTOR_STORE_SUPPORT = new NodeFeature("mapper.sparse_vector.store_support");
     public static final NodeFeature SORT_FIELDS_CHECK_FOR_NESTED_OBJECT_FIX = new NodeFeature("mapper.nested.sorting_fields_check_fix");
@@ -49,6 +50,7 @@ public Set<NodeFeature> getTestFeatures() {
             COUNTED_KEYWORD_SYNTHETIC_SOURCE_NATIVE_SUPPORT,
             SORT_FIELDS_CHECK_FOR_NESTED_OBJECT_FIX,
             DYNAMIC_HANDLING_IN_COPY_TO,
+            TSDB_NESTED_FIELD_SUPPORT,
             SourceFieldMapper.SYNTHETIC_RECOVERY_SOURCE,
             ObjectMapper.SUBOBJECTS_FALSE_MAPPING_UPDATE_FIX
         );