Index is unrecoverable – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch cannot recover an index due to severe corruption or loss of data. This could be due to hardware failure, file system corruption, or a bug in Elasticsearch. To resolve this issue, you can try to restore the index from a snapshot if one exists. If no snapshot is available, you may need to reindex the data from the original source. In some cases, you may need to delete the corrupted index and create a new one. Always ensure to have a backup strategy to prevent data loss.

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

Log Context

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

 terminal.println("You can allocate a new; empty; primary shard with the following command:");  printRerouteCommand(shardPath; terminal; false);  throw new ElasticsearchException("Index is unrecoverable");
 }  terminal.println("-----------------------------------------------------------------------");
 if (indexStatus != CleanStatus.CLEAN) {
 loseDataDetailsBanner(terminal; indexCleanStatus);


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