How to delete/hide fields in logstash filter

Hi
How should i delete the fields "_id", "_type", "_index", "_score" in logstash filter so that these fields does not show up in the kibana dashboard ?

In the mutate filter, remove field does not delete these fields
remove_field => ["_id", "_type", "_index", "_score" ]

Regards

Those fields are system fields set by Elasticsearch, so you can not remove them in Logstash.