Unable to fetch shard snapshot files for %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch is unable to retrieve the snapshot files for a specific shard. This could be due to issues with the snapshot repository, network connectivity, or file corruption. To resolve this, you can try the following: 1) Verify the snapshot repository’s configuration and accessibility. 2) Check network connectivity between Elasticsearch and the repository. 3) If the snapshot is corrupted, consider creating a new snapshot. 4) If the shard data is corrupted, you may need to reindex the data.

This guide will help you check for common problems that cause the log ” Unable to fetch shard snapshot files for %s ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, snapshot, recovery, shard.

Log Context

Log “Unable to fetch shard snapshot files for %s” classname is ShardSnapshotsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            Version commitLuceneVersion = segmentCommitInfos.getCommitLuceneVersion();
            return Optional.of(
                new ShardSnapshot(latestShardSnapshot; blobStoreIndexShardSnapshot.indexFiles(); userData; commitLuceneVersion)
        } catch (Exception e) {
            logger.warn(() -> format("Unable to fetch shard snapshot files for %s"; latestShardSnapshot); e);
            return Optional.empty();

    protected boolean masterSupportsFetchingLatestSnapshots() {


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