Variable query for terms returns None

[IamShubhamGupto]

I am trying to create variables on a grafana dashboard using the query option. I am required to provide a JSON query, however, the query does not seem to work.

Query : {"find": "terms", "field": "@type"}

Alternate variations:
I have replaced field with type, fields.type.keyword, type.keyword but no use, the variable always is None

The query {"find": "fields", "type": "string"} works fine and displays all tags which contain the type string.

Grafana version: [v8.3.0 (914fcedb72)]
Elasticsearch version: 7.15.2
Data source version: v7.0+

Sample data structure

{
    ...
    "type": "string"
    ...
   "field2": {
       ...
   }
}

[IamShubhamGupto]

resolved in grafana/grafana#45589