Translog looks like version 1 or later but has corrupted header – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.5

Briefly, this error occurs when the translog file of Elasticsearch is corrupted. The translog (transaction log) is a durability layer that Elasticsearch uses to prevent data loss. Corruption can occur due to unexpected shutdowns or disk failures. To resolve this issue, you can try to recover the translog. If that doesn’t work, you may need to delete the corrupted translog file. However, be aware that deleting the translog file can lead to data loss. It’s also recommended to regularly back up your data to prevent such issues.

This guide will help you check for common problems that cause the log ” translog looks like version 1 or later; but has corrupted header ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, version.

Log Context

Log “translog looks like version 1 or later; but has corrupted header” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // so we know if we grab the first byte; it can be:
 // 0x3f => Lucene's magic number; so we can assume it's version 1 or later
 // 0x00 => version 0 of the translog
 final byte b1 = Channels.readFromFileChannel(channel; 0; 1)[0];
 if (b1 == 0x3f) { // LUCENE_CODEC_HEADER_BYTE
 throw new TranslogCorruptedException(path.toString(); "translog looks like version 1 or later; but has corrupted header");
 } else if (b1 == 0x00) { // UNVERSIONED_TRANSLOG_HEADER_BYTE
 throw new IllegalStateException("pre-1.4 translog found [" + path + "]");


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