Cannot snapshot shard on a readonly repository – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” cannot snapshot shard on a readonly repository ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: snapshot, repositories, shard, blobstore, repository.

Log Context

Log “cannot snapshot shard on a readonly repository”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public void snapshotShard(SnapshotShardContext context) {
 if (isReadOnly()) {
 context.onFailure(new RepositoryException(; "cannot snapshot shard on a readonly repository"));
 final Store store =;
 final IndexCommit snapshotIndexCommit = context.indexCommit();
 final ShardId shardId = store.shardId();


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