Can some let me know why i am getting this error on ELK 7.8.0
Jun 24 08:59:02 nagiosclient.sg.com systemd[1]: Starting Elasticsearch...
Jun 24 08:59:06 nagiosclient.sg.com systemd-entrypoint[11107]: uncaught exception in thread [main]
Jun 24 08:59:06 nagiosclient.sg.com systemd-entrypoint[11107]: java.lang.IllegalStateException: Unable to access 'path.data' (/var/lib/elasticsearch)
Jun 24 08:59:06 nagiosclient.sg.com systemd-entrypoint[11107]: Likely root cause: java.nio.file.AccessDeniedException: /var/lib/elasticsearch
Jun 24 08:59:06 nagiosclient.sg.com systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE
Jun 24 08:59:06 nagiosclient.sg.com systemd[1]: Failed to start Elasticsearch.
Jun 24 08:59:06 nagiosclient.sg.com systemd[1]: Unit elasticsearch.service entered failed state.
Jun 24 08:59:06 nagiosclient.sg.com systemd[1]: elasticsearch.service failed.