Hi,
I am using Linux system.
I do not want logstash to write any log either under location "/usr/share/logstash/logs" or under "/var/log/logstash".
I want to completely disable all type of logging for logstash.
Please let me know what should I do?
I'm not sure that's possible. Why do you want to do that?
@magnusbaeck,
It is consuming huge disk space, hence do not want to store any logs.
Modifying your logstash.yml to have log.level: warn or log.level:error might help. But it might also be worth reading those logs and understanding why it is logging so much.
For example, in one of my instances, I had hundreds of megabytes of errors from xml filters that were failing because the xml was getting truncated upstream. Adding a simple check to see if the xml text ended in > before applying the xml filter cut the logs by 95%.
@Badger, True. Even for me, i had written ruby filters for 4.x version and the same code i am using for 6.2 version. that might be the problem. I am checking the same but meanwhile i wanted to stop the logs. I changed it to fatal level. Now, for time being, nothing is being written. 
Would it be possible to change the path to which logstash logs to to /dev/null?
If you set path.logs to /dev/null then you get an exception
2018-06-12 16:03:48,264 main ERROR Unable to create file /dev/null/logstash-plain.log java.io.IOException: File /dev/null exists and is not a directory. Unable to create directory.
I expect you could update log4j.properties to avoid this.
Thank you very much! let me check log4j.properties.