Delayed reroute ” + reason + ” failed – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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

Log Context

Log “delayed reroute [” + reason + “] failed”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 ActionListener.onFailure(currentListeners; new ElasticsearchException("delayed reroute [" + reason + "] failed"; e));
 public void clusterStateProcessed(ClusterState oldState; ClusterState newState) {
 ActionListener.onResponse(currentListeners; newState);


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