Is there any way to remove log.syslog.structured_data field in logscale/kibana

Question

I am trying to parse checkpoint and fortinet logs through logstash and get log.syslog.structured_data field in kibana/logscale .Is there any way to remove it ? I know it represents structured data expressed in RFC 5424 messages but I want to exclude that field completely as it's a complete replica of @rawstring

my filter.conf is

 grok {
      match => {"message" => "%{SYSLOG5424PRI}%{GREEDYDATA:message}" }
      overwrite => [ "message" ]
    }

 mutate {
    remove_field => ["tags", "input", "log", "event", "@timestamp", "agent", "ecs", "@version", "host"]
  }

 kv {
    field_split => " "
    value_split => "="
  }

 mutate {
    remove_field => ["message"]
    rename => { "<(\d+)>date" => "date" }
    add_field => { "logdate" => "%{date} %{time}"}
  }

 date {
 
    match => ["logdate", "yyyy-MM-dd HH:mm:ss" ]
    timezone => "Europe/London"
    target => "@timestamp"
  }

 mutate {
 
    remove_field => ["logdate", "date", "time"]
    convert => { "rcvdbyte" => "integer"}
    convert => { "sentbyte" => "integer"}
 
  }
  mutate{ remove_field => [ "[log][syslog][structured_data]"] }
 
}
}

I tried removing from filebeat.yml as well but it didn't work

  - add_host_metadata:
      when.not.contains.tags: forwarded
  - add_cloud_metadata: ~
  - add_docker_metadata: ~
  - add_kubernetes_metadata: ~
  - decode_json_fields:
      fields: ["message"]
      target: ""
      overwrite_keys: true
  - drop_fields:
      fields: ["log.syslog.structured_data"]