I can't help you with the Netflow module, as I can't recommend that you use it. You should consider ElastiFlow
The Logstash module was based on v1.0.0 of ElastiFlow, and is now way behind on functionality. You can see some of the differences here...
Robert Cowart (rob@koiossian.com)
www.koiossian.com
True Turnkey SOLUTIONS for the Elastic Stack