Could not determine repository generation from root blobs – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.4-8.9

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Briefly, this error occurs when Elasticsearch cannot identify the repository generation from root blobs, usually due to a corrupted or missing blob file in the snapshot repository. To resolve this issue, you can try the following: 1) Restore the missing or corrupted blob file from a backup, if available. 2) Delete and recreate the snapshot repository, but this will remove all existing snapshots. 3) Use the Elasticsearch cleanup API to remove the corrupted data, but this should be used with caution as it can lead to data loss.

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This guide will help you check for common problems that cause the log ” Could not determine repository generation from root blobs ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: blobstore, repository, repositories.

Log Context

Log “Could not determine repository generation from root blobs” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final long generation;
 try {
 generation = latestIndexBlobId();
 } catch (Exception e) {
 new RepositoryException(; "Could not determine repository generation from root blobs"; e)
 genToLoad = latestKnownRepoGen.accumulateAndGet(generation; Math::max);
 if (genToLoad > generation) {


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