previous discuss
https://discuss.elastic.co/t/not-to-add-host-path-field/49889/2

Hi.

With this configuration,

input {
    file {
       codec ... json
        path   => ...
    }
}
output {
    elasticsearch {
        ...
    }
}

logstash will add fields 'host' and 'path' to the origin document.

  "_source": {
   ...
    "path": "/home1/.logstash/input/default_agg_daily/0505.json",
    "host": "xyzzzz"
  },

And I want to remove path and host by

mutate {remove_fileds => [...] }

But some case the origin document may contain field 'path' and/or 'host'.
So I can not use remove_filds simply.

How about provide an option to disable host and path field adding?