In the weekly roundup "This Week in Elastic," Leslie Hawthorn presents the latest developments and updates in the ELK Stack ecosystem, highlighting the release of Elasticsearch for Apache Hadoop 2.1 RC1 with enhancements for Spark SQL and security. The post covers the removal of rivers from Elasticsearch, urging users to transition to alternatives like Logstash. It also features community contributions, such as a video tutorial by Dimitris Ganosis on using the ELK Stack and a guest blog by Search Technologies on their Aspire framework for unstructured data. The roundup promotes upcoming global meetups and events, including training sessions and conferences across various countries, to engage and educate users and developers about Elasticsearch, Logstash, and Kibana. Additionally, the post encourages feedback on the new JDBC input plugin and emphasizes the vibrant community involvement in expanding the ELK Stack's reach and capabilities.