Failed to apply cluster settings – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

Briefly, this error occurs when Elasticsearch is unable to apply the updated cluster settings due to issues like incorrect syntax, invalid settings, or network problems. To resolve this, you can verify the syntax and validity of your settings. If they are correct, check your network connectivity. If the issue persists, consider restarting your Elasticsearch cluster. Also, ensure that your Elasticsearch version supports the settings you’re trying to apply.

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, 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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