Logstash Output

[ektangandhi]

I am running a program to produce output to logstash.
It outputs my msg in an unreadable format : \u0000Oq\u0000\u0000Pt\u0000\u001
Is there a way to solve this.. Am i missing config settings.

In the elasticsearch output i am giving codec-> json

Also,even when i set codec to UTF-8, i keep seeing this:

Received an event that has a different character encoding than you configured. {:text=>"testng.jarq\u0000~\u0000Fsq\u0000~\u0000\e\u0000\u0000\u0000\xCCq\u0000~\u0000\xA4q\u0000~\u0000\xA5t\u0000", :expected_charset=>"UTF-8", :level=>:warn}