Couchbase 5.0 introduces several performance and feature enhancements to its N1QL technology, focusing on improved indexing and query efficiency. Performance improvements include index projection, which reduces resource use by considering only relevant index keys, and the offloading of operations, such as COUNT(DISTINCT), to the indexer instead of the N1QL service, boosting performance. New query capabilities allow LIMIT, ORDER BY, and OFFSET operators to appear in the indexer, enhancing query processing efficiency. In terms of feature enhancements, Couchbase 5.0 simplifies array indexing syntax and relaxes previous restrictions, such as mandatory variable and whole array index key requirements, allowing for more flexible and efficient indexing. Additionally, the release expands the indexing capabilities to include document meta information, such as CAS and expiration properties, enabling more comprehensive querying options. These advancements collectively enhance the performance and scalability of Couchbase Server clusters while providing developers with more robust query capabilities.