How to set elasticsearch upsert content in logstash

I am trying to index/update same event as json chunks (due to event size limit set by input file plugin) using elastic search output plugin. I can see only the last updated chunk in the elastisearch index. I would like to add new fields to the existing index rather than completely replacing with the new fields. Please suggest a way to accomplish my use case. Thank you.

After a while, I came across this issue in GitHub https://github.com/logstash-plugins/logstash-output-elasticsearch/issues/383

Dynamic action isn't working with upsert

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