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

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

Briefly, this error occurs when you try to define a dynamic template in Elasticsearch without providing a name for it. A dynamic template is used to automatically apply a mapping template to new fields as they are added to an index. To resolve this issue, you should ensure that the dynamic template is defined with a 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: template and index.

Log Context

Log “A dynamic template must be defined with a name”classname  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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