I've purchased the Logstash Book and try to configure a test farm. It is recommended at the Book using a Redis between shipper and logstash. Now I configure filebeat and read here that "Redis output for the Beats is deprecated, because it is compatible with the Redis input plugin".
I do not understand this: an output plugin is deprecated because it is compatible with an input plugin.
And, is it still recommended to use Redis in between a shipper (filebeat in this case) and logstash?
Or is it recommended from now on not to use Redis?