
High Availability Architecture
Apr 14, 2017 · Databases
This article reviews the latest Elasticsearch 5.x enhancements—including append‑only indexing, range fields, removal of the _all field, unified highlighter, keyword normalizer, multi‑word synonyms, field collapsing, cancellable searches, partitioned term aggregations, cluster allocation explain, Java REST client updates, cross‑cluster search, batched reduce phases—and previews the major features expected in Elasticsearch 6.0 such as sparse doc values, index sorting, sequence numbers, seamless rolling upgrades, type removal, index‑template inheritance, load‑aware shard routing, and X‑Pack extensions like SQL and machine learning.