A dynamic template must be defined with a name – 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’re trying to create a dynamic template in Elasticsearch without providing a name. Dynamic templates in Elasticsearch require a unique name for identification. To resolve this issue, you should ensure that you provide a unique name when defining your dynamic template. Also, check your syntax to ensure it’s correct. If you’re using an API, ensure that the request body includes the template name.

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This guide will help you check for common problems that cause the log ” A dynamic template must be defined with a name ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, template.

Log Context

Log “A dynamic template must be defined with a name” class name is RootObjectMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 List tmplNodes = (List) fieldNode;
 List templates = new ArrayList<>();
 for (Object tmplNode : tmplNodes) {
 Map tmpl = (Map) tmplNode;
 if (tmpl.size() != 1) {
 throw new MapperParsingException("A dynamic template must be defined with a name");
 Map.Entry entry = tmpl.entrySet().iterator().next();
 String templateName = entry.getKey();
 Map templateParams = (Map) entry.getValue();
 DynamicTemplate template = DynamicTemplate.parse(templateName; templateParams);


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