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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.

skills/elasticsearch/elasticsearch-reindex/SKILL.md

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# 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](https://github.com/elastic/cli#configuration) is not installed, tell the user what it is needed for. Do
not guess credentials, call the HTTP API directly, or attempt other workarounds.