Elasticsearch Date millis is not parsed

I am on grafana 6.4.5 and trying to make a simple dashboard that queres a Raw Document from elasticsearch.
All works fine except that the date in not parsed and stays as integer . _msearch returns the following for example {…“date”: 1667872547000, …}

ElasticSearch mapping for date is {type: “date”,“format”:“epoch_millis”}.
The grafana does not parse the date into human-readable format but keeps it as integer.