Cluster Operations

An ILM cookbook: data tiers without the surprise bill

June 9, 2026 · QueryCrunch

Index lifecycle management is where retention policy becomes storage cost. Working recipes for hot/warm/cold/frozen phases, the min_age semantics that trip everyone, and the checks that keep policies actually running.

Shard sizing rules that survive contact with production

May 14, 2026 · QueryCrunch

Oversharding wastes heap; undersharding stalls recovery. The working rules for shard count and size on Elasticsearch and OpenSearch, and how to check where your cluster stands today.