Failed to load metadata – 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 load the metadata associated with an index or cluster. This could be due to corruption of the metadata files, insufficient permissions, or disk space issues. To resolve this, you can try restoring the metadata from a backup, checking and adjusting file permissions, or freeing up disk space. If the metadata is corrupted, you may need to recreate the index or cluster. Always ensure regular backups to prevent data loss.

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

Log Context

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

 snapshotMapBuilder.put(snapshot; unmodifiableMap(shardMapBuilder));
 return new NodeSnapshotStatus(clusterService.localNode(); unmodifiableMap(snapshotMapBuilder));
 } catch (Exception e) {
 throw new ElasticsearchException("failed to load metadata"; e);
 }  public static class Request extends BaseNodesRequest {


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