Shard failures – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to allocate shards to nodes in the cluster. This could be due to insufficient disk space, network connectivity issues, or configuration errors. To resolve this, you can try increasing the disk space, checking the network connectivity between nodes, or reviewing the shard allocation settings. Additionally, ensure that the Elasticsearch cluster health status is green and not red or yellow, which indicates issues. Lastly, check the Elasticsearch logs for more specific error messages that can help identify the problem.

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

Log Context

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

 if (totalOps == expectedTotalOps) {
 } else if (totalOps > expectedTotalOps) {
 throw new AssertionError(
 "unexpected higher total ops [" + totalOps + "] compared to expected [" + expectedTotalOps + "]";
 new SearchPhaseExecutionException(getName(); "Shard failures"; null; buildShardFailures())
 } else {
 if (lastShard == false) {
 performPhaseOnShard(shardIndex; shardIt; nextShard);


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