Not able to remove event with filters

[koushick patel]

Can you tell to filter event based on a namespace?

I need to remove all event on kube-system namespace which has string "INFO" on key log.

For reference below is the reference

{

  "_index": "logstash-2021.06.23",

  "_type": "_doc",

  "_id": "s2hwN3oB72jfr9DdcfTG",

  "_version": 1,

  "_score": null,

  "_source": {

    "log": "2021-06-23T05:55:53.034Z [INFO] 10.2.1.222:51479 - 24104 \"AAAA IN daas-alh.daas.svc.cluster.local. udp 49 false 512\" NOERROR qr,rd 142 0.000066921s\n",

    "stream": "stdout",

}

}

I have used @type grep but did not worked