Ignore the entire message if one field is nil

Elastic Stack Logstash
1

Hi, Im filtering some CSV files,and Im getting some nil fields, and if some field is nil the entire message is worthless, so how can I ignore the entire message if one of the fields value is nil?

Thanks!

2

if ![field_name] { drop { } }

4

I end up using ruby

ruby {
          code => "event.cancel if event.get('ifInUtilizationPct').nil?"
        }