ElasticSearch filter query for having null value

Question

I want to filter data from elasic search document like documents which is having blank list. HOw can i achieve that. Suppose i want this results.

1) { name:'vipul', gender:[] }

this is having blank list

Answer 1

You can combine a bool query with a exists query like so:

"bool": {
    "must_not": [
        {
            "exists": {
                "field": "gender"
            }
        }
    ]
}