Agent skill · elastic
elasticsearch-reindex
Guide Elasticsearch reindex for performance: local and remote, slicing, throttling, task API. Use when copying or migrating indices, changing mappings, or transforming during reindex.
What it needs
About 6k tokens when loaded.
What this skill does
Elasticsearch Reindex Copy documents from source indices or data streams to a destination using POST /reindex. An expert reindex workflow prepares the destination explicitly, chooses local versus remote execution, filters at the source when only a subset is needed, runs long copies asynchronously, tracks the task to completion, and verifies the destination document count before reporting results. <!-- begin-partial: preamble --> Environment Configuration This skill executes Elasticsearch operations through the elastic CLI. If the elastic CLI is not installed, tell the user what it is needed for. Do not guess credentials, call the HTTP API directly, or attempt other workarounds. This skill references operations in HTTP-shorthand form (e.g., GET /, GET /cat/indices, GET /{index}/mapping, GET /{index}/settings/index.mode, POST /query). The Operations table at the end of this document maps each shorthand to the equivalent elastic CLI command — always use the CLI rather than calling the HTTP API directly. <!-- end-partial: preamble --> Process 1. Confirm connectivity and deployment type. Call GET /. Read buildflavor and version.number to know whether shard, replica, and cluster-settings APIs are available (Serverless manages shards/replicas internally and blocks most cluster/ APIs). The decision: continue only when the cluster is reachable. If the call fails, stop — do not guess endpoints or credentials. 2. Decide local versus remote reindex. Compare where the source and destination live. Same cluster — use local reindex: source.index and dest.index only. Do not add source.remote when both indices are on the cluster you are connected to. Different cluster — use reindex from remote: add source.remote with the remote cluster URL and credentials. Remote reindex does not support slicing; compensate with query-based partitioning (date ranges, term filters) across parallel requests. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills elastic/elasticsearch-reindex--b90a87