Thanks. I'm able to handle this with KV plugin. In my case I created nested field in logstash similar to here, Best Way to create nested field
Now I need to show this nested data in Kibana. I guess Kibana doesnt support nested field in 5.6.13. So earlier I was using copy_to through java code. I need to use same copy_to approach in logstash. Putting it simple, how can I create copy_to fields in Logstash??