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

Opster Team

March-22, Version: 1.7-8.0

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This guide will help you check for common problems that cause the log ” cannot clone shard snapshot 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 clone shard snapshot on a readonly repository”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

RepositoryShardId shardId;
 @Nullable ShardGeneration shardGeneration;
 ActionListener listener
 ) {
 if (isReadOnly()) {
 listener.onFailure(new RepositoryException(; "cannot clone shard snapshot on a readonly repository"));
 final IndexId index = shardId.index();
 final int shardNum = shardId.shardId();
 final Executor executor = threadPool.executor(ThreadPool.Names.SNAPSHOT);


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