Logstash std / tcp output has a duplicate entry field logentry

I use mongodb input plugin to get latest document from mongodb and send it to logstash as input, And output as STDOUT & a TCP port and in both the output I see an extra field added in my json data as "log_entry" and it contains a duplicate set of all Key and value again.

Why is this happening or how to dissable it, My output value as below,

Please post an example event produced by Logstash along with your configuration.

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