Failed to apply reserved error cluster state – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch is unable to update the cluster state due to issues like network problems, node failures, or configuration errors. To resolve this, you can try the following: 1) Check the network connectivity between the nodes. 2) Verify the health of the nodes in the cluster. 3) Review the cluster settings and configurations to ensure they are correct. 4) Check the Elasticsearch logs for more detailed error messages that can help identify the root cause.

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

Log Context

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

          "Successfully applied new reserved error state for namespace [{}]"; errorState.namespace());

                public void onFailure(Exception e) {
                    logger.error("Failed to apply reserved error cluster state"; e);


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