Please excuse my ignorance, but I need some direction on the best way to upgrade to Elasticsearch 6.0 in the OVA version of Graylog. I have done several omnibus upgrades of Graylog, and have recently successfully upgraded to 2.5, but I would like to to the Elasticsearch 6.0 upgrade in preparation for Graylog 3.0.
I have done an Elasticsearch upgrade using the dkpg instruction on the Elasticsearch site, but the version that Graylog uses did not get upgraded. I did some looking around, and found that the dkpg version got installed in /usr/share/elasticsearch and Graylog seems to use the version in /opt/graylog/elasticsearch
What is the best process for upgrading the Graylog version? I tried to just copy all of the files from one location to the other, but that caused thing to stop working, so I assume that there is some subset of the files to be copied, or some special process that I am not aware of.
Any assistance would be greatly appreciated, thanks!