Failed to verify index – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to validate the index due to issues like corruption, missing files, or incorrect settings. To resolve this, you can try the following: 1) Check the Elasticsearch logs for more detailed error information. 2) Verify the index settings and mappings are correct. 3) If the index is corrupted, consider restoring it from a backup. 4) If files are missing, ensure that the Elasticsearch data directory is correctly configured and accessible. 5) If all else fails, you may need to recreate the index.

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This guide will help you check for common problems that cause the log ” Failed to verify index ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: metadata, index, cluster.

Log Context

Log “Failed to verify index” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // version; so we need to verify its compatibility.
 newIndexMetadata = indexMetadataVerifier.verifyIndexMetadata(newIndexMetadata; minIndexCompatibilityVersion);
 try {
 indicesService.verifyIndexMetadata(newIndexMetadata; newIndexMetadata);
 } catch (Exception e) {
 throw new ElasticsearchException("Failed to verify index " + index; e);
 metadata.put(newIndexMetadata; true);
 }  // Always removes index closed blocks (note: this can fail on-going close index actions)


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