Unknown error occurred while updating cluster state – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected issue while updating the cluster state. This could be due to network issues, insufficient resources, or a problem with the cluster state. To resolve this, you can try restarting the Elasticsearch nodes, checking for network connectivity issues, or increasing the resources allocated to Elasticsearch. If the problem persists, you may need to check the cluster state and fix any inconsistencies or corruption.

This guide will help you check for common problems that cause the log ” Unknown error occurred while updating cluster state ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, cluster.

Log Context

Log “Unknown error occurred while updating cluster state” class name is AbstractTransportSetResetModeAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 });  ActionListener clusterStateUpdateListener = ActionListener.wrap(acknowledgedResponse -> {
 if (acknowledgedResponse.isAcknowledged() == false) {
 wrappedListener.onFailure(new ElasticsearchTimeoutException("Unknown error occurred while updating cluster state"));
 }; wrappedListener::onFailure);


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