Reroute after update settings failed – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch tries to reroute shards after updating settings but fails due to issues like insufficient resources, network problems, or incorrect settings. To resolve this, you can check the cluster’s health and ensure it has enough resources. Verify network connectivity between nodes. Review the updated settings for any errors or inconsistencies. If the problem persists, consider rolling back the settings update to the previous state.

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

Log Context

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

 } else {
 listener.onFailure(new ElasticsearchException("reroute after update settings failed"; e));