[Feature Request] Support searching from doc_value using termQueryCaseInsensitive/termQuery in flat_object/keyword field

[kkewwei]

Is your feature request related to a problem? Please describe

Now we can't search value using termQueryCaseInsensitive/termQuery in keyword field if the index=false, but we can search value from the numeric field if the index=false.

PUT t1
{
    "mappings": {
        "properties":{
            "keyword1":{
                "type": "keyword",
                "index":"false"
            },
             "int1":{
                "type": "integer",
                "index":"false"
            }
        }
    }
}

As example, field int1 can be searched using termQueryCaseInsensitive/termQuery, but keyword1 can't.

Describe the solution you'd like

We can search from doc_value using termQueryCaseInsensitive/termQuery in flat_object/keyword field, even if index=false

Related component

Search

Describe alternatives you've considered

No response

Additional context

No response