Failed to verify index – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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.

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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