The new Couchbase 6.5 release introduces extensive Enterprise Grade Database Query capabilities, including transactional support, Analytical Window functions, user-defined JavaScript functions, and Index Advisor to improve query performance. The release also includes a set of new enhancements to further strengthen the Couchbase Index Service, improving operational efficiency with features such as dynamic settings changes without indexer restarts, improved DCP rollback handling, optimized in-memory snapshotting, and projector memory usage improvements. Additionally, the release introduces a new `BUILD INDEX` command to rebuild all unbuilt indexes at once, allows scans during indexer warm-up, and provides stat information for each index, including its last known scan time and key size distribution. The Index UI has also been improved with important summary information about each index, including requests/sec, resident ratio, items, data size, and status. These enhancements are designed to address customer requests and improve the overall performance and manageability of the Couchbase platform.