I had an issue with logstash restarting so I updated ip2location plugin and now it keeps restarting every 15 seconds. The error before was ConcurrentModificationException: null.
I use logstash v 7.4.2 and the plugin version is 2.1.4
Another issue is that it does not write logs to /var/log/logstash now
I have run it using these 2 commands but got no result and besides, now it does not even write to log file (/usr/share/logstash/logstash-plain.log) anymore:
You will need to run it as the user that systemd uses, and you will need to start it using the command shown in /etc/systemd/system/logstash.service. Also, if the EnvironmentFile entries set anything of significance you will need those variables set.
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