The install is a little weird, I had to do a few uninstalls, cleans, and reinstalls in particular orders when shit was just randomly breaking.
Changing the container config in the UI doesn't seem to update the actual config in the files itself so this is kind of a problem if you forget to swap out the generic hostnames for the actual IPs or the actual hostname.
If I were going to tell someone how to install this I would say, they need a clean slate and to install in this order, Redis, Elasticsearch, then Diskover. Start redis before elasticsearch, start ES before diskover, then diskover at the end. It should 'just work'. When you get the initial screen I believe you just need to pick your index under index 1 and click "select" then it will crawl your files. The actual crawling does not take that long.
One thing that I ran into during getting this up and running is that on one of my attempts redis was just randomly not working and so because of that the crawl wasn't doing anything even though there were 'workers'. I ended up just uninstalling everything again, clearing all of the directories and then reinstalling in that order. I also believe I used elasticsearch 5.6.16.