How to get matching field in match _all query

[warkolm (Mark Walkom)]

Please don't post the same thing multiple times

Elasticsearch return match fields

I am trying GET _search { "query": { "match": { "_all":"MCRFX" } } } I need to find which field the match happened, if that can be found. I am open to use another query, the idea is to search a value in all index and all docs and come up with with relevant doc and field where match happened. Thanks