Preety print json in output

Elastic Stack Logstash
1

I am using filbeat as input and Elastic search as output.
using json filter to parse json msgs.
But I dont see output coming in proper json format (preety print) in Kibana .

I tried with Ruby filter to print preety json and can see output well kibana but logstash logs throws ruby exception
[logstash.filters.ruby ] Ruby exception occurred: A JSON text must at least contain two octets!

If I am not wrong, this comes if logstash tries to parse empty string.

few questions:

  1. why with json filter , I don't see preety print output?
  2. any other way than ruby filter ?
  3. how to handle empty msgs?
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