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 – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

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Briefly, this error occurs when Elasticsearch detects a shard on a path that has a different index UUID. This typically happens when an index is deleted and recreated with the same name, but the old shards are not properly removed. To resolve this issue, you can manually delete the leftover shard files from the Elasticsearch data directory. Alternatively, you can use the Elasticsearch API to reroute the shard to a different node, which will automatically delete the old shard files. Always ensure to backup your data before performing these operations to prevent data loss.

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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 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 ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index and shard.

Log Context

Log “{} 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” classname is ShardPath.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         Path loadedPath = null;
        for (Path path : paths) {
            ShardStateMetaData load = ShardStateMetaData.FORMAT.loadLatestState(logger; 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);
                }
                if (loadedPath == null) {
                    loadedPath = path;
                } else{




 

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