Cannot restore index – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.6-7.13

Briefly, this error occurs when Elasticsearch is unable to restore an index from a snapshot due to various reasons such as the index already existing, insufficient permissions, or a corrupted snapshot. To resolve this issue, you can delete the existing index before restoring, ensure the Elasticsearch cluster has the necessary permissions to access the snapshot repository, or check the snapshot’s integrity and recreate it if it’s corrupted.

This guide will help you check for common problems that cause the log ” cannot restore index [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, restore.

Log Context

Log “cannot restore index [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 request.indexSettings(); request.ignoreIndexSettings());
 try {
 snapshotIndexMetadata = indexMetadataVerifier.verifyIndexMetadata(snapshotIndexMetadata;
 } catch (Exception ex) {
 throw new SnapshotRestoreException(snapshot; "cannot restore index [" + index +
 "] because it cannot be upgraded"; ex);
 // Check that the index is closed or doesn't exist
 IndexMetadata currentIndexMetadata = currentState.metadata().index(renamedIndexName);
 IntSet ignoreShards = new IntHashSet();