Failed to install template – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.7-8.2

Briefly, this error occurs when Elasticsearch is unable to install an index template due to issues like incorrect template syntax, insufficient permissions, or a conflict with an existing template. To resolve this, ensure the template syntax is correct and compatible with your Elasticsearch version. Check if the user has the necessary permissions to create a template. If a template with the same name exists, consider deleting or renaming the existing one before installing the new template.

This guide will help you check for common problems that cause the log ” Failed to install template [{}] ” 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 [{}]” 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(new ParameterizedMessage("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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