Failed recovery – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters issues during the recovery process of a shard. This could be due to insufficient disk space, network connectivity issues, or corruption of the shard data. To resolve this, you can try freeing up disk space, checking network connectivity, or using the Elasticsearch shard recovery APIs to manually recover the shard. If the shard data is corrupted, you may need to restore from a backup.

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

Log Context

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

 } else {
 if (indexShard.state() == IndexShardState.CLOSED) {
 // got closed on us; just ignore this recovery
 } else {
 listener.onFailure(new IndexShardRecoveryException(shardId; "failed recovery"; ex));