Elastic Stack 5.0 alpha 4 introduces several new features and improvements across its components, including Elasticsearch, Kibana, Logstash, Beats, and ES-Hadoop, although it remains an alpha release not recommended for production use. Highlights include Elasticsearch's new low-level Java HTTP/REST client, Rollover and Shrink APIs for easier index management, and a Migration Helper tool for transitioning from version 2.3.x to 5.0. Kibana now supports direct CSV data import into Elasticsearch and improved monitoring through X-Pack, along with a new Management app for configurations. Logstash sees enhancements in plugin-level metrics for better debugging and optimizations for Elasticsearch output, while also supporting Apache Kafka version 0.10. Beats introduces a new MongoDB monitoring module and an Apache module dashboard in Kibana, and ES-Hadoop has also been updated to version 5.0.0-alpha4.