Much has happened since 5.0. Persistent queues, pipeline viewer (x-ray vision, basically) and the ability to run multiple pipelines at the same time for different use cases, and a move to the latest version of JRuby — it's all laying the foundation for even more goodness to come.
See where the Logstash roadmap is headed and what to expect next.
Logstash Creator & Tech Lead
Logstash Team Lead