- What? No! logstash-forwarder is deprecated. Don't use it.
- I suggest you use the documentation and blog posts on elastic.co and ask specific questions on discuss.elastic.co when you run into trouble.
- It's an informational message telling you that the output of a command is appended to a file named nohup.out. The init script you use for logstash-forwarder isn't very well-written.