First off, not sure if this would fit better in the main logstash forum, as it's about the input plugin which doesn't seem to technically be part of logstash-forwarder.
So, logstash-forwarder allows me to specify SSL client certificates, but the jumberjack input plugin doesn't appear to do any validation of them, and in fact doesn't allow me to specify a CA or list of CAs to validate them against. What's going on here? Is this just not fully implemented yet? If I implement it and make a pull request would there be interest?