I know that Tuple and UDT Faceting is not supported in DSE Search but technically it is possible via OSS SOLR using parent / child documents BlockJoin support in Faceting (see https://issues.apache.org/jira/browse/SOLR-5743). Is there any way it can be achieved in DSE Search somehow or the feature is totally missing? If it is missing, is there any way to override the default Tuple Field Transformer to implement on my own?