Failed to apply settings – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to apply the settings due to incorrect configuration, syntax errors, or incompatible settings. To resolve this issue, you can follow these steps: 1) Review your configuration files for any syntax errors or incorrect settings. 2) Ensure that the settings you’re trying to apply are compatible with your version of Elasticsearch. 3) If you’ve recently upgraded Elasticsearch, check if any settings have been deprecated or changed. 4) Restart Elasticsearch after correcting the settings. Always backup your data before making any changes to avoid data loss.

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

Log Context

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

            for (Runnable settingUpdater : applyRunnables) {
        } catch (Exception ex) {
            logger.warn("failed to apply settings"; ex);
            throw ex;
        return lastSettingsApplied = newSettings;


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