Run zero-downtime Elasticsearch reindex with alias swap
domain: elastic.co · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Never point apps at concrete index names — always read/write through an alias
Create new index with updated mapping
_reindex from old to new (with slices for parallelism); apply deletes/updates since start via a second pass or queue replay
Atomically swap: POST /_aliases with remove+add in one body
Delete old index after verification
Known gotchas
Mappings are immutable for existing fields — reindex is the ONLY way to change a field type
_reindex is not a snapshot: writes during reindex are missed without a catch-up strategy
Alias swap in two calls (remove then add) has a window where the alias points nowhere — must be one atomic _aliases call
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