Shard does not seem to be corrupted at – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch is unable to identify any corruption within a shard. This could be due to a false alarm or a misinterpretation of the shard’s state. To resolve this issue, you can try the following: 1) Verify the shard’s health status using the cluster health API. 2) If the shard is unassigned, use the cluster reroute API to manually assign it. 3) If the error persists, consider restarting the Elasticsearch node. Always ensure you have a backup of your data to prevent any loss.

This guide will help you check for common problems that cause the log ” Shard does not seem to be corrupted at ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, index.

Log Context

Log “Shard does not seem to be corrupted at” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 ////////// Drop corrupted data
 final CleanStatus indexStatus = indexCleanStatus.v1();
 final CleanStatus translogStatus = translogCleanStatus.v1();  if (indexStatus == CleanStatus.CLEAN && translogStatus == CleanStatus.CLEAN) {
 throw new ElasticsearchException("Shard does not seem to be corrupted at " + shardPath.getDataPath()
 + " (pass --" + TRUNCATE_CLEAN_TRANSLOG_FLAG + " to truncate the translog anyway)");
 }  if (indexStatus == CleanStatus.UNRECOVERABLE) {
 if (indexCleanStatus.v2() != null) {