Keep your beats input. It's the Filebeat messages we want to look at.
2017-09-05 01:00:08.092 131 00000000-0000-0000-0000-000000000000 user (null) (null) (null) (null) Information this is a message
I want to see the messages processed by Logstash, written to the Logstash log. Not the input messages.