Elasticsearch Won't Start After Upgrading from 5.5 to 6.0

[megadevx (Devin Ferguson)]

We tried to see if this was the issue as this user had a similar error message with the Elasticsearch's status:

Elasticsearch Service won't start after full cluster upgrade from 5.4 to 6.0

There was no log written in /var/log/elasticsearch Just this [2017-11-16T15:29:15,264][INFO ][o.e.x.m.j.p.NativeController] Native controller process has stopped - no new native processes can be started [2017-11-16T15:29:17,862][INFO ][o.e.n.Node ] [elk-node-1] stopped [2017-11-16T15:29:17,862][INFO ][o.e.n.Node ] [elk-node-1] closing ... [2017-11-16T15:29:19,388][INFO ][o.e.n.Node ] [elk-node-1] closed

However we are still seeing the same errors as above.