A dynamic template must be defined with a name – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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.

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);