How to update config without logstash service stops?

hi there!

My necessity is to see the streaming logs in kibana.
So, I use tcp input plugin in logstash confg.
It works properly almost 1 year.

But the problem is that I stream several apps logs to logstash now.
If I want to change some grok patterns, I have to stop logstash service, edit the config and restart logstash service.
Then related applications and logstash connections are lost.
In this situation, I have to do manually re-connect between apps and logstash service.

Is there anyway to re-connect automatically
OR how to update logstash config without logstash service stops / restarts?

Plz advise to me.
Thank you very much!

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