LogStash: IdentityMapCodec has reached 100% capacity

In the Logstash logs, I see lots of errors such as like IdentityMapCodec has reached 100% capacity" and stops prcessing mesages .
message=>"IdentityMapCodec has reached 100% capacity", :current_size=>20000, :upper_limit=>20000, :level=>:error}

How can I fix this issue ?

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I am also facing this kind of issue. Did any one have fix on this?