Kibana _source field is not searchable

[TrumanDu (Truman P Du)]

but i turn off query feature ,no problem.

turn on

{
  "size": 500,
  "query": {
    "bool": {
      "filter": [
        {
          "bool": {
            "should": [          {
                "exists": {
                  "field": "_source"
                }
              }
            ]
          }
        }
      ]
    }
  }
}

turn off no filter _source

why this index kuery,query can add this filter.but other index no can add filter.

kibana version 6.4.0

[bhavyarm]

Hello,

@TrumanDu

why this index kuery,query can add this filter.but other index no can add filter.

Can you please explain what do you mean by that ^? What other index are you referring to here?

Thanks,
Bhavya