Unexpected error during deletion of unallocated shard – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch tries to delete an unallocated shard but encounters an unexpected issue. This could be due to a network glitch, disk space issue, or a bug in the OpenSearch software. To resolve this, you can try to manually delete the shard if it’s not needed, check the network connectivity between nodes, ensure there’s enough disk space, or update OpenSearch to the latest version to fix potential bugs. If the problem persists, consider reindexing the data and recreating the shard.

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

Log Context

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

                        indicesService.deleteShardStore("no longer used"; shardId; currentState);
                    } catch (Exception ex) {
                        logger.debug(() -> new ParameterizedMessage("{} failed to delete unallocated shard; ignoring"; shardId); ex);
                (source; e) -> logger.error(() -> new ParameterizedMessage("{} unexpected error during deletion of unallocated shard";
                    shardId); e)



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