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Diagnose OpenSearch vector-search hot shards before RAG latency spikes

A practical runbook to separate real shard pressure, skewed routing, and slow search symptoms without blaming the LLM by reflex.

Learn how to detect hot shards in OpenSearch vector indices, prove whether they affect RAG retrieval, and apply safe mitigations with Dev Tools, metrics, and canaries.

Created: July 6, 2026

Published: July 6, 2026

Estimated time45 min

LevelAdvanced

Before you startRead access to OpenSearch Dev Tools or equivalent API permissions.

PlatformsLinux / Docker

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Docker

Run the same flow from an ephemeral container if your bastion lacks tooling.

dockerOS and OS_TOKEN variablesnetwork access to OpenSearch

Ephemeral shell with curl and jq

docker run --rm -it -e OS -e OS_TOKEN curlimages/curl:latest sh

Also available inDiagnosticar hot shards de búsqueda vectorial en OpenSearch antes de disparar la latencia RAG

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