How to sync specific fields based on common values of three different collections in MongoDB to ElasticSearch using logstash pipeline

In Logstash Pipeline we are using mongoDB as input plugin and we are using three different collection to sync specific Fields in Elasticsearch Index based on common values of different collections. But How to sync specific fields on common values of three different collections using logstash pipeline. I am not able to find the solution. urgent help required.

Thanks.

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