Currently we have an ELK cluster, where Logstash has a "beats" input with SSL certificates to authenticate incoming data (mainly from metricbeat). I have a 2nd remote logstash instance that inputs data over UDP from within a Docker cluster, and I'd like to ship these logs to the main ELK cluster, using certificates for authentication and encryption.
However Logstash doesn't seem to have a "beats" output. What is the best way to ship data from one Logstash to another using certificates to authenticate the incoming data?