Logstash to Logstash Flow, Where to filter the logs

Hello Team,
I am trying to send logs from LOgstash A to Logstash B , and from logstash B to elasticsearch . My question is where do I have to filter the logs and add additional fields to the messages. In logstash A or Logsatsh B . Also Is there any good Grok constructor that you would advise. I am a new to the elk environment.



It depends on where you want to process the logs at. There is no spot where you HAVE to process your logs.
I currently am processing all of my logs on Logstash B, but I could easily process them at Logstash A if I wanted.

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