Couchbase Server 6.5 GA has been released with several key features, including distributed ACID transactions, advanced query capabilities like window functions, index advisor, cost-based optimizer, eventing enhancements, and improved HA and observability. The new release also introduces collections to allow applications to structure their data by keeping similar documents together, just like tables do in relational databases. Additionally, the release includes advanced filtering in XDCR, Quality of Service for XDCR, robust rebalance operation, node-to-node encryption, LDAP group support, TLS cipher configuration, and significant improvements to backup and recovery. The new version also provides unparalleled performance at any scale, with the ability to create up to 30 buckets in a single cluster and improved storage compression.