Filebeat connection to logstash during ES upgrade

I am planning ES upgrade in Tets environment.
I have one question about the FB and LS connection. If I stop LS during ES upgrade duration, will al filebeat still be running, even though they don't have connection with the log stash?
How long filebeat or logstash can survive without connection to logatash? Are there any maximum number of retries after which filebeat will dead.?


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