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