Duration calculation failing

[Rudolf_Reddy_Macejka]

Hello,

I am trying to calculate duration by grog and inspirated by another topis here.
So I have this code:

  date {
    match => [ "time","UNIX_MS" ]
    target => "@timestamp"
    remove_field => [ "time" ]
  }

  mutate {
    add_field => { "[request][time]" => "%{@timestamp}" }
  }

  date {
    match => [ "[legs][0][timestamp]","UNIX_MS" ]
    target => "[response][time]"
  }

  ruby {
    code => "event['durationNew'] = Time.parse(event['[response][time]'] - event['[request][time]'])"
  }

But I am getting this error:
[2019-02-21T13:31:27,726][ERROR][logstash.filters.ruby ] Ruby exception occurred: Direct event field references (i.e. event['field']) have been disabled in favor of using event get and set methods (e.g. event.get('field')). Please consult the Logstash 5.0 breaking changes documentation for more details.

Any idea what is wrong?

Thanks and Regards, Reddy

[Badger]

@Rudolf_Reddy_Macejka

"event['durationNew'] = Time.parse(event['[response][time]'] - event['[request][time]'])"

This should be

"event.set('durationNew', Time.parse(event.get('[response][time]') - event.get('[request][time]')))"