Automating Index Lifecycle with ISM in OpenSearch: Rollover, Force Merge, and Auto-Delete
· 5 min read
Log indices grow without bound unless you manage them. OpenSearch Index State Management (ISM) lets you define policies that automatically roll over active write indices when they hit a size or document threshold, and delete old ones after a retention period. This post shows how to build and verify a complete lifecycle policy on a live OpenSearch 2.19.1 cluster managed by FoundryDB.
All commands use YOUR_OPENSEARCH_HOST and YOUR_PASSWORD as placeholders.
OpenSearch cluster, query fan-out & gather
Cluster green · search fans out to one copy per shard, then gathers
Coordinatorfan-out / gatherquery →Data nodesP0 P1 P2 · R0 R1 R2⇠ hitsCluster-managershard allocation