Error updating 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 update a template. This could be due to network issues, insufficient permissions, or an invalid template. To resolve this, ensure that the OpenSearch cluster is reachable and operating correctly. Check that the user has the necessary permissions to update templates. Finally, verify that the template being updated is valid and correctly formatted.

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This guide will help you check for common problems that cause the log ” Error updating 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 updating 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().putTemplate(request; new ActionListener() {
                public void onResponse(AcknowledgedResponse response) {
                    if (response.isAcknowledged() == false) {
                        logger.warn("Error updating template [{}]; request was not acknowledged"; change.getKey());



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