Script processor for retaning relevant fields not working

I am writing a script processor which will retain only the relevant fields and remove all the other fields . Here 'message','custom_field','@timestamp','_index','_id','_version','index_name','tags', is getting retained but the fields like 'audit.log.0','audit.log.1','event.type','auditd.log.key','event.dataset','event.created','event.original','event.ingested' is not getting retained .

Please provide me a solution . Also i dont want to use remove processor and logstash , I want to handle this using ingest pipeline only since I am using filebeats audit ingest pipeline for parsing the events

      "script": {
        "source": """

Reply guys

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