Failed to apply cluster settings – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

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

Briefly, this error message indicates that Elasticsearch was unable to apply cluster settings. The reason for this error could be a problem with the Elasticsearch instance or a problem with the cluster settings being applied. To resolve the issue, the cluster settings should be checked for errors or Elasticsearch should be restarted.

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. Take a self-guided product tour to see for yourself (no registration required).

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

Log Context

Log “Failed to apply cluster settings” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             if (clusterChangedEvent.state().blocks().disableStatePersistence() == false && clusterChangedEvent.metaDataChanged()) {
                final Settings incomingSettings = clusterChangedEvent.state().metaData().settings();
        } catch (Exception ex) {
            logger.warn("failed to apply cluster settings"; ex);

        logger.debug("apply cluster state with version {}"; newClusterState.version());


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