Check index failed – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to perform a health check on an index, possibly due to corruption, misconfiguration, or insufficient resources. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed error messages. 2) Verify the index configuration and ensure it’s correct. 3) Check if the Elasticsearch cluster has sufficient resources (CPU, memory, disk space). 4) If the index is corrupted, consider restoring it from a backup. 5) If none of the above works, you may need to recreate the index.

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

Log Context

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

 try {
 } catch (IOException ex) {
 throw new RecoveryFailedException(recoveryState; "check index failed"; ex);
 }  void checkIndex() throws IOException {