I killed logstash process, but this process still remain.
so I tried to kill the process with 'kill -9 [PID]', but I got error message like bash: kill: (36888) - No such process
even if it is existing and then chaning the PID.
Logstash tries to close connections in a "polite" way to avoid loss of data. That's why it is taking so long to shutdown. It has a pipeline.unsafe_shutdown flag in the /etc/logstash/logstash.yml file. if you assign true it will shutdown faster.
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