Thanks. I am setting this up all on a single server for testing. I tried sending the logs directly to filebeats on the same server and then onto logstash with a custom config file (modified version of the one in the link above) but it did not work well.
So I am wondering where I should focus my efforts. Sending to filebeats (may need to be a separate server?), send directly to logstash (mixed results with that), or something else? If there is a way to do this all on the same server, please advise what port I should use and how to get the service listening. To send to logstash I had to modify the OPTIONS field in securityonion.conf. Again, not sure if I was going down the right path!