Dynamic template syntax error An array of named objects is expected – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

Briefly, this error occurs when the dynamic template in Elasticsearch is incorrectly formatted. Dynamic templates require an array of named objects, and if this structure is not followed, it will result in a syntax error. To resolve this issue, you should review your dynamic template and ensure it follows the correct syntax. Make sure that the template is an array of named objects. Each object should have a name and contain the properties ‘match_mapping_type’, ‘match’, ‘unmatch’, ‘path_match’, ‘path_unmatch’, ‘match_pattern’, ‘mapping’. Correcting the syntax should resolve the error.

This guide will help you check for common problems that cause the log ” Dynamic template syntax error. An array of named objects is expected. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, template.

Log Context

Log “Dynamic template syntax error. An array of named objects is expected.” class name is RootObjectMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if ((fieldNode instanceof List) == false) {
 throw new MapperParsingException("Dynamic template syntax error. An array of named objects is expected.");
 List tmplNodes = (List) fieldNode;
 List templates = new ArrayList<>();
 for (Object tmplNode : tmplNodes) {
 Map tmpl = (Map) tmplNode;


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