Create field value based on parsed logs

Hi guys!

We have SNMP trap logs. We send this logs using filebeat. Our filebeat configuration:

- input_type: log
  paths: ["/var/log/snmptrapd.log"]
    tagtype: linux
    tagapps: traps
    logtype: traps-diagnostic
  close_timeout: 1h
  multiline.pattern: '[0-9]+-[0-9]+-[0-9]+.[0-9]+:[0-9]+:[0-9]+,[0-9]{3}'
  multiline.negate: true
  multiline.match: after

We want to get trap types and assign this value to specific field (I want simply known If It's possible). For example I want to create field trap-type and assign value for this field based on parsed log. Example of log:
resourceConservationMode trap from <host>

I want to assign "resourceConservationMode" to field trap-type. It must be dynamically. So , If it will be new trap type , It will assign new value. I want simply search logs by trap type field. Does It possible?

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