Deleting leftover shard on path with a different index UUID – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch tries to delete a shard that is associated with a different index UUID than expected. This could be due to a mismatch between the index metadata and the actual data on disk. To resolve this issue, you can try to restart the OpenSearch node, which may help in syncing the metadata. If the problem persists, you may need to manually delete the problematic shard, but this should be done with caution as it could lead to data loss. Always ensure to have a backup before performing such operations.

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This guide will help you check for common problems that cause the log ” {} deleting leftover shard on path: [{}] with a different index UUID ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, shard.

Log Context

Log “{} deleting leftover shard on path: [{}] with a different index UUID” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        for (Path path : paths) {
            // EMPTY is safe here because we never call namedObject
            ShardStateMetadata load = ShardStateMetadata.FORMAT.loadLatestState(logger; NamedXContentRegistry.EMPTY; path);
            if (load != null) {
                if (load.indexUUID.equals(indexUUID) == false && IndexMetadata.INDEX_UUID_NA_VALUE.equals(load.indexUUID) == false) {
                    logger.warn("{} deleting leftover shard on path: [{}] with a different index UUID"; lock.getShardId(); path);
                    assert Files.isDirectory(path) : path + " is not a directory";
                    NodeEnvironment.acquireFSLockForPaths(indexSettings; paths);


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