Publishing unexpectedly failed – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.9-8.9

Briefly, this error occurs when Elasticsearch encounters issues while trying to publish cluster state updates to other nodes. This could be due to network issues, overloaded nodes, or a node leaving the cluster unexpectedly. To resolve this, you can check the network connectivity between nodes, ensure nodes are not overloaded by monitoring their usage, and check the cluster’s health to ensure all nodes are properly connected. If a node has left the cluster, you may need to re-add it or replace it.

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

Log Context

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

 } catch (FailedToCommitClusterStateException failedToCommitClusterStateException) {
 } catch (Exception e) {
 assert false : e; // all exceptions should already be caught and wrapped in a FailedToCommitClusterStateException
 logger.error(() -> "[" + clusterStatePublicationEvent.getSummary() + "] publishing unexpectedly failed"; e);
 publishListener.onFailure(new FailedToCommitClusterStateException("publishing unexpectedly failed"; e));
 }  // there is no equals on cluster state; so we just serialize it to XContent and compare Maps
 // deserialized from the resulting JSON


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