--prop val set elasticsearch property (i.e. -Des.<prop>=<val>)
</pre>
For version 1.7 on Ubuntu 16.04, although the system uses SystemD, there is still a SysV init script that controls elasticsearch. I think this means that you can't get the logging info into the journalctl system... See /etc/init.d/elasticsearch According to the [https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html install guide], you should be able to edit the elasticsearch.service file, and take out the --quiet option to make it log to the journal. When that is enabled, you can do <code>journalctl --unit elasticsearch</code> to quickly see the info being logged.
== Production Configuration ==