Elastic 9.5: Columnar, VectorDB index mode & auto-calibration, and AI-driven alert triage

Elasticsearch 9.5 introduces Columnar Mode, an opt-in indexing mode that stores fields in a column store for reduced storage and faster analytical queries. It also introduces Columnar Logs, a specialized profile for log data that keeps a single inverted index on the message field for fast full-text search while storing everything else columnarly. VectorDB index mode is introduced for high-performance vector search with a single setting, automatically tuning quantization, merge policy, and cache loading.