Shard must have a valid translog UUID – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

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Briefly, this error occurs when Elasticsearch cannot find a valid transaction log (translog) UUID for a shard. The translog UUID is crucial for data recovery and consistency. This error might be due to a corrupted translog or a failed shard recovery process. To resolve this issue, you can try to perform a full cluster restart or manually delete the corrupted translog files. However, be aware that manual deletion might lead to data loss. Another solution could be to restore the data from a snapshot if one is available.

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This guide will help you check for common problems that cause the log ” shard must have a valid translog UUID ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, index.

Log Context

Log “shard must have a valid translog UUID” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // Retrieve the generation and UUID from the existing data
 commitData = commits.get(commits.size() - 1).getUserData();
 final String translogUUID = commitData.get(Translog.TRANSLOG_UUID_KEY);
 if (translogUUID == null) {
 throw new ElasticsearchException("shard must have a valid translog UUID");
 }  final long globalCheckpoint = commitData.containsKey(SequenceNumbers.MAX_SEQ_NO)
 ? Long.parseLong(commitData.get(SequenceNumbers.MAX_SEQ_NO))
 : SequenceNumbers.UNASSIGNED_SEQ_NO;


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