The 5.5.0 release of Elasticsearch for Apache Hadoop (ES-Hadoop) brings several updates, including reintroduced support for Kerberos in the Elasticsearch HDFS Repository Plugin, which was previously dropped due to security model challenges. This release also introduces a new delimiter for index formatting, allowing both colon and pipe characters, with the colon set to be deprecated in future versions. It warns of the impending removal of support for TTL and Timestamp mapping configurations in Elasticsearch 6.0, while still maintaining them for backward compatibility with Elasticsearch 5.x and below. Furthermore, support for Hadoop 1.x is deprecated, with complete removal planned for version 6.0, aligning with the broader ecosystem's shift to Hadoop 2.2 and above. Additionally, the Elasticsearch on YARN project, which was a beta experiment for deploying Elasticsearch on YARN, is deprecated due to YARN's lack of support for long-running services, redirecting focus to other enhancements within ES-Hadoop.