How to restrict nodes while indexing to elastic search


I am trying to index application logs to elastic search using file beats.
Here I observed in elastic search, it created for each document hosts,agent..etc nodes, but I am interested only in message field Node.

so is there a way to restrict these nodes with out indexing to elastic search with in beats module ?
do we have to use logstash in middle to mutate the fields?

Please suggest on the same.

Rakesh Katakam.

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