Failed to install template TEMPLATE NAME – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to install a specified template. This could be due to a variety of reasons such as incorrect template syntax, insufficient permissions, or a non-existent template. To resolve this issue, you can check the syntax of your template, ensure that you have the necessary permissions to install the template, or verify that the template exists. Additionally, you can also check the Elasticsearch logs for more detailed error messages that can help you troubleshoot the problem.

This guide will help you check for common problems that cause the log ” Failed to install template [” + TEMPLATE_NAME + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: template, plugin.

Log Context

Log “Failed to install template [” + TEMPLATE_NAME + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            if (installed) {
                logger.debug("Template [{}] has been updated"; TEMPLATE_NAME);
            } else {
                logger.debug("Template [{}] appears to be up to date"; TEMPLATE_NAME);
        }; e -> logger.warn(() -> "Failed to install template [" + TEMPLATE_NAME + "]"; e)));

    private void checkForAliasStateChange(ClusterState state) {
        final IndexAbstraction aliasInfo = state.getMetadata().getIndicesLookup().get(ALIAS_NAME);
        final boolean previousState = aliasExists;


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