Merging multiple logstash output document into one by a common field

I'm a beginner to logstash. I have created multiple documents based on some grok pattern for a particular log event.
Now, before passing documents to elastic search I want to merge those documents having common field into a single document.I'm not sure if I can do this using aggregate filter.
So either I can combine similar log events into a single log or I can merge similar output documents into one document.
Which is better and How can I achieve this ?

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