Error deleting template request was not acknowledged – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to acknowledge a request to delete a template. This could be due to network issues, insufficient permissions, or the template not existing. To resolve this, ensure the template exists before attempting to delete it. Check your network connection and ensure OpenSearch is running properly. Also, verify that your user account has the necessary permissions to delete templates. If the problem persists, consider restarting OpenSearch or checking for any underlying system issues.

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This guide will help you check for common problems that cause the log ” Error deleting template [{}]; request was not acknowledged ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, request, template, metadata.

Log Context

Log “Error deleting template [{}]; request was not acknowledged” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            client.admin().indices().deleteTemplate(request; new ActionListener() {
                public void onResponse(AcknowledgedResponse response) {
                    if (response.isAcknowledged() == false) {
                        logger.warn("Error deleting template [{}]; request was not acknowledged"; template);



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