Invalid dynamic name expression – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch encounters an invalid dynamic name expression in the mapping. This usually happens when you’re trying to use a dynamic template and the field name pattern is incorrectly defined. To resolve this issue, you should review your dynamic templates and ensure that the field name patterns are correctly defined. Also, make sure that the field names in your documents match the patterns defined in your dynamic templates.

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This guide will help you check for common problems that cause the log ” invalid dynamic name expression [{}]. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: metadata, cluster.

Log Context

Log “invalid dynamic name expression [{}].” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (inDateFormat == false) {
 inDateFormat = true;
 } else {
 throw new ElasticsearchParseException("invalid dynamic name expression [{}]." +
 " invalid character in placeholder at position [{}]"; new String(text; from; length); i);
 break;  case RIGHT_BOUND:


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