Template must not be empty – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when you try to create an index template in Elasticsearch without providing any content in the template. Elasticsearch requires a valid JSON object to define the settings and mappings for the index template. To resolve this issue, ensure that you are providing a valid JSON object in the body of the request when creating the index template. This JSON object should include the necessary settings and mappings for the index template. If you are using a file to provide the template, make sure the file is not empty and contains valid JSON.

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This guide will help you check for common problems that cause the log ” Template must not be empty ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, template.

Log Context

Log “Template must not be empty” class name is TemplateUtils.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public static void validate(String source) {
 if (source == null) {
 throw new ElasticsearchParseException("Template must not be null");
 if (Strings.isEmpty(source)) {
 throw new ElasticsearchParseException("Template must not be empty");
 }  try {
 XContentHelper.convertToMap(JsonXContent.jsonXContent; source; false);
 } catch (Exception e) {


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