Logstash ran as service won't read logs only when ran through the command line

that was one of the suggestions in this post Pipelines.yml ignored on logstash running as a service

to change line below in /etc/systemd/system/logstash.service

ExecStart=/usr/share/logstash/bin/logstash "--path.settings" "/etc/logstash"

to

ExecStart=/usr/share/logstash/bin/logstash 

But I've reverted the change