如何在Java的Elasticsearch中知道索引的类型是否具有父或子关系？

GetMappingsRequest getRequest = new  GetMappingsRequest().indices("indexname");GetMappingsResponse cs = client.admin().indices().getMappings(getRequest).get();ImmutableOpenMap<String, MappingmetaData> mappingStr = cs.mappings().get("indexname");for (ObjectObjectCursor<String, MappingmetaData> c : mappingStr) { Map m = (Map) c.value.getSourceAsMap().get("_parent"); if (m != null) {     if (typeName.equals(m.get("type")))         types.add(c.key); }}if(types.size>0){  return true;}else{ return false;}