Cannot restore index ” + index + ” because it cannot be upgraded – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

Briefly, this error message indicates that Elasticsearch is unable to restore an index because it cannot be upgraded to the current version of Elasticsearch. Elasticsearch indexes are not backward compatible, which means that indexes created with an older version of Elasticsearch cannot be used with a newer version of Elasticsearch. To resolve this issue, you should create a new index with the current version of Elasticsearch and reindex your data into the new index.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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

Log Context

Log “cannot restore index [” + index + “] because it cannot be upgraded”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

snapshotIndexMetadata = convertLegacyIndex(snapshotIndexMetadata; currentState);
 try {
 snapshotIndexMetadata = indexMetadataVerifier.verifyIndexMetadata(snapshotIndexMetadata; minIndexCompatibilityVersion);
 } catch (Exception ex) {
 throw new SnapshotRestoreException(snapshot; "cannot restore index [" + index + "] because it cannot be upgraded"; ex);
 final String renamedIndexName = indexEntry.getKey();
 final IndexMetadata currentIndexMetadata = currentState.metadata().index(renamedIndexName);
 final SnapshotRecoverySource recoverySource = new SnapshotRecoverySource(


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