Two steps forward, one step backward - backward compatibility in Elasticsearch
summary
Elasticsearch explains how backwards breaks are managed: a deprecation logger emits warnings that surface in HTTP warning headers and logs, and the Kibana upgrade assistant runs cluster, index and node checks (e.g., default shards changing from five to one). Migration tools include reindex from remote to avoid multiple reindexes and cross-cluster search to query three major versions at once. Protocol-level StreamInput/Output branches on version, and risky removals (delete-by-query) are reintroduced safely using long‑running tasks.
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chapters (7)
- 0:00Start
- 5:59Complexities
- 9:08What blocks users from upgrading?
- 12:24Compatibility guarantees
- 23:21Deprecation checks - Machine Learning
- 32:00Example: REST API version compatibility #51816
- 34:01Strategy: Reindex from remote
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