For anyone who spun up ES using the metron mpack, it looks like there has been an issue for a while (dating back to ~0.2.1 via a quick git blame, it may go back longer) if you specify multiple disks for your ES nodes (path_data) using the format provided in the Ambari tooltip.
I have submit a PR <https://github.com/apache/metron/pull/1329> to fix this, but a quick fix is to change your format from: "/mnt/first","/mnt/second" to [ "/mnt/first", "/mnt/second" ] -- Jon Zeolla
