Couchbase Server 4.6 introduces significant enhancements to its Full-Text Search (FTS) capabilities, offering performance improvements, custom index type mapping by key, and custom sorting options. The update features MossStore, a new default key-value store mechanism that boosts speed and efficiency by sorting index segments in memory before persisting them. This release enables developers to create custom index mappings using document keys to determine types, facilitating a common data modeling style where document type is indicated by key prefixes. Users can now sort search results by any indexed document field, providing more tailored search results beyond the default sorting by relevance score. Although FTS remains in developer preview, users are encouraged to explore these improvements and provide feedback to influence future development.