Logstash kafka input

I am trying logstash kafka input. generally all plugins wrap the message in "message", but kafka input showing without message field.

{"msg" => "validationStatus : S","hostName" => "xxxxccrc-val","level" => "INFO","logger" => "Log","methodName" => "validate","thread" => "http-bio-8080-exec-3","version" => nil,"Line" =>183,"requestId" => "1467299356596","batchNumber" => "0","@version" => "1","@timestamp" =>"2016-06-30T15:09:16.777Z"}

but I am looking the message like other plugins give. with message field included.

{"message": {"msg" => "validationStatus : S","hostName" => "xxxxccrc-val","level" => "INFO","logger" => "Log","methodName" => "validate","thread" => "http-bio-8080-exec-3","version" => nil,"Line" =>183,"requestId" => "1467299356596","batchNumber" => "0"}","@version" => "1","@timestamp" =>"2016-06-30T15:09:16.777Z"}