Observed Signal · Aug 18, 2026 · Product Launch · Source: OpenSearch · Impact: 3/5
Online index migration and shard scaling in OpenSearch with the AOSC plugin
The OpenSearch blog announced AOSC (Automatic Online Schema Change), an open-source Apache 2.0 plugin developed by Atlassian Labs that migrates a live OpenSearch index to a pre-created target with different mappings, settings, or shard count within the same cluster. The plugin backfills existing documents, replays writes arriving during the copy, and swaps an alias after a brief write block, requiring applications to implement simple retry logic. Shard-count changes are safe for same-count or power-of-two growth; other layouts carry caveats. The announcement was published on August 18, 2026, with no scheduled future event.
AOSC addresses a critical operational gap in OpenSearch by enabling live index migrations with changed mappings or shard counts without a long outage, reducing reliance on hand-built reconciliation pipelines. As an open-source Atlassian Labs project, it has the potential to become a standard tool for OpenSearch operators managing production indices.
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Key Takeaways & Evidence Grounding
- AOSC is an open-source OpenSearch plugin developed by Atlassian Labs and licensed under Apache 2.0.
- The plugin migrates a live index to a pre-created target index within the same cluster, supporting changes to mappings, settings, shard count, or document shape.
- AOSC backfills existing documents, replays operation history for writes made during migration, and swaps an alias after a short write block.
- Safe shard-count changes are limited to same-count or power-of-two growth; other layouts may leave stale documents when custom routing is used.
- The announcement was published on the OpenSearch blog on August 18, 2026.
Connected Companies & Entities
2 Entities mapped“OpenSearch is the search engine that AOSC extends; the plugin runs inside an OpenSearch cluster and the announcement was published on the of...”
“Atlassian's engineering blog provides the production story behind AOSC, describing the environment in which the plugin was developed and use...”
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