Upgrading clusters using cross-cluster replication
Clusters that are actively using cross-cluster replication require a careful approach to upgrades. The following conditions could cause index following to fail during rolling upgrades:
- Clusters that have not yet been upgraded will reject new index settings or mapping types that are replicated from an upgraded cluster.
- Nodes in a cluster that has not been upgraded will reject index files from a node in an upgraded cluster when index following tries to fall back to file-based recovery. This limitation is due to Lucene not being forward compatible.
The approach to running a rolling upgrade on clusters where cross-cluster replication is enabled differs based on uni-directional and bi-directional index following.
© 2023-2025 Elasticsearch
As of September 2024, Elasticsearch is available under a choice of three licenses: the Server Side Public License (SSPL), the Elastic License, or the AGPLv3 (OSI approved).
Elasticsearch and the Elasticsearch logo are trademarks of Elasticsearch B.V., registered in the U.S. and in other countries.
https://www.elastic.co/guide/en/elasticsearch/reference/8.17/ccr-upgrading.html
