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

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch identifies a shard on a specific path that is associated with a different index UUID. This usually happens due to incorrect manual manipulation of index files or a failed recovery process. To resolve this, you can try to restore the index from a backup, or delete and recreate the index if the data is not critical. If the issue persists, you may need to perform a full cluster restart. Always ensure to follow proper procedures when manipulating index files to avoid such issues.

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

Log Context

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

        for (Path path : availableShardPaths) {
            // 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("{} found shard on path: [{}] with a different index UUID - this "
                        + "shard seems to be leftover from a different index with the same name. "
                        + "Remove the leftover shard in order to reuse the path with the current index"; shardId; path);
                    throw new IllegalStateException(shardId + " index UUID in shard state was: " + load.indexUUID
                        + " expected: " + indexUUID + " on shard path: " + path);


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