%s unexpected error during deletion of unallocated shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected issue while trying to delete an unallocated shard. This could be due to a variety of reasons such as insufficient permissions, disk space issues, or network connectivity problems. To resolve this issue, you can try the following: 1) Check and ensure that Elasticsearch has the necessary permissions to delete shards. 2) Verify that there is enough disk space available. 3) Check the network connectivity between the nodes. 4) Restart the Elasticsearch service. If the problem persists, consider seeking professional assistance.

This guide will help you check for common problems that cause the log ” %s unexpected error during deletion of unallocated shard ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, shard.

Log Context

Log “%s unexpected error during deletion of unallocated shard” classname is IndicesStore.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    public void onResponse(Void unused) {}

                    public void onFailure(Exception e) {
                        logger.error(() -> format("%s unexpected error during deletion of unallocated shard"; shardId); e);



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