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Index alias.

also: index aliases · alias swap · zero-downtime reindexing · reindex · reindexing

A stable name pointing to a real index; reindex into a new index, then swap the alias atomically for a zero-downtime switch.

the two-minute refresher

Mapping or analyzer changes need a full reindex.
The application always queries 'products'; the alias points at products_v1.
Build products_v2, catch up on changes, then swap the alias in one atomic step.
Rollback is swapping the alias back.

Where the course teaches it

W07 · Day 2Indexing Pipelinelearn it →W07 · Day 2Indexing Pipelinerevisit →

Related concepts

Change data capture
Text analysis