How to fix ElasticSearch ‘Fielddata is disabled on text fields by default’ for keyword field
The comment of @Andrey Borisko was correct
I used
"field": "user.keyword" instead of
"field": "user" based on Nikhil's example and it worked for me.
I found the reason behind the unexpected error. The ES wasn't getting re-indexed properly. Once I deleted the indexed first and then recreated it then it started working like a charm.
Check out the documentation in the elastic which clearly mentions that we cannot use the text field for aggregations, sorting, or scripting
https://www.elastic.co/guide/en/elasticsearch/reference/current/text.html#fielddata-mapping-param
This can be achieved with help of keyword usage. Try searching by
"field" : "user.keyword"