One or more required cgroup files or directories not found in logstash

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@sanjay_bhati

I am getting error: One or more required cgroup files or directories not found

That is normally a DEBUG message, not an ERROR. It should not stop anything working.

sincedb_path => "NULL"

That will persist the in-memory sincedb to a file called NULL in logstash's working directory. On Windows you should use "NUL", on UNIX use "/dev/null".