Detected a corrupted repository index – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.13

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Briefly, this error occurs when Elasticsearch detects that a repository, which is used for storing, snapshotting, and restoring data, is corrupted. This could be due to issues like hardware failure, network issues, or software bugs. To resolve this, you can try the following: 1) Restore the data from a backup if available. 2) Try to repair the repository if possible. 3) Check the underlying storage system for any issues and fix them. 4) If the corrupted repository is not critical, you can delete and recreate it. Always ensure to have a robust backup strategy to prevent data loss.

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This guide will help you check for common problems that cause the log ” Detected a corrupted repository; index ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, index.

Log Context

Log “Detected a corrupted repository; index” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final SnapshotId snapshotId = snapshots.get(uuid);
 if (snapshotId == null) {
 // A snapshotted index references a snapshot which does not exist in
 // the list of snapshots. This can happen when multiple clusters in
 // different versions create or delete snapshot in the same repository.
 throw new ElasticsearchParseException("Detected a corrupted repository; index " + indexId
 + " references an unknown snapshot uuid [" + uuid + "]");


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