Couchbase Server 5.5 introduces index partitioning, a feature that enhances indexing capabilities by allowing the distribution of index load across multiple nodes using hashing, which complements the existing method of creating index replicas. This approach facilitates balanced index scan loads, improves performance by enabling parallel query execution on each partition, and supports partition elimination for faster query responses without increased latency. To implement index partitioning, users must specify fields for partitioning, ideally immutable ones, to minimize partition skew and reduce latency through efficient query alignment with index partitions. However, this feature is exclusive to the Enterprise Edition, and users are encouraged to explore its benefits by downloading the Couchbase Server 5.5 release and engaging with the community through forums for further inquiries and feedback.