Invalid template – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch encounters an issue with the index template. This could be due to a syntax error, incorrect field type, or missing required fields in the template. To resolve this, you should first validate the JSON syntax of your template. Then, ensure that all required fields are present and field types are correctly defined. If the error persists, consider removing and recreating the template.

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

Log Context

Log “Invalid template” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  try {
 XContentHelper.convertToMap(JsonXContent.jsonXContent; source; false);
 } catch (Exception e) {
 throw new ElasticsearchParseException("Invalid template"; e);
 }  private static String replaceVariables(String input; String version; String versionProperty; Map variables) {
 String template = replaceVariable(input; versionProperty; version);


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