How to know if a type of a index has parent or child relationship in Elasticsearch in java?

Question

I have documents with parent-child relationship in Elasticsearch . When I do hasParentQuery or hasChildQuery , I need to know if a type of an index has parent-child relationship. Is it possible to achieve that, using Java client?

Answer 1

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;
}