index_filter support for field capabilities API elastic search compatible endpoints

[ruoliu2]

Is your feature request related to a problem? Please describe.
Need index filter support for field capabilities API for large scale dataset, give good entry point for understanding data.

Describe the solution you'd like
support index_filter for field capacities API

support query dsl in the index filter to support filter feature, and gives list of fields and their features (as normal field cap API) after filtering

Describe alternatives you've considered
NA

elastic search API doc
https://www.elastic.co/docs/api/doc/elasticsearch/v8/operation/operation-field-caps-1

example use case with elastic search
http://localhost:9200/test/_field_caps?fields=* { "index_filter": { "term": { "age": 25 } }, }
example response

{
    "indices": [
        "test"
    ],
    "fields": {
        "hair": {
            "text": {
                "type": "text",
                "metadata_field": false,
                "searchable": true,
                "aggregatable": false
            }
        },
        "city": {
            "text": {
                "type": "text",
                "metadata_field": false,
                "searchable": true,
                "aggregatable": false
            }
        },
        "name": {
            "text": {
                "type": "text",
                "metadata_field": false,
                "searchable": true,
                "aggregatable": false
            }
        },
    }
}

[rdettai]

Could you specify your feature request a bit?

• are you referring to the field capabilities API?
• could you describe the usecase a bit more?

[ruoliu2]

• yes I'm referring to the field capabilities API
• I just updated the description some more, let me know if its good

[rdettai]

It's perfect thanks! Do you want to give it a try?

[ruoliu2]

yeah I'd love to! I'll take a look this weekend