Shard must have a valid translog generation and UUID but got and – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.6

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Briefly, this error occurs when Elasticsearch cannot find a valid transaction log (translog) generation and UUID for a shard. This could be due to data corruption, disk issues, or a bug in Elasticsearch. To resolve this issue, you can try to restart the Elasticsearch node, check for disk issues, or restore the data from a backup. If the problem persists, you may need to delete and recreate the index, but this should be the last resort as it will result in data loss.

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

Log Context

Log “shard must have a valid translog generation and UUID but got: [{}] and: [{}]” 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 translogGeneration = commitData.get(Translog.TRANSLOG_GENERATION_KEY);
 final String translogUUID = commitData.get(Translog.TRANSLOG_UUID_KEY);
 if (translogGeneration == null || translogUUID == null) {
 throw new ElasticsearchException("shard must have a valid translog generation and UUID but got: [{}] and: [{}]";
 translogGeneration; translogUUID);
 }  final long globalCheckpoint = commitData.containsKey(SequenceNumbers.MAX_SEQ_NO)
 ? Long.parseLong(commitData.get(SequenceNumbers.MAX_SEQ_NO))


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