Invalid dynamic name expression missing date format – 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 tries to create a dynamic field name using a date expression, but the date format is missing or incorrect. To resolve this issue, you can either provide a valid date format in the mapping or disable dynamic date detection. Alternatively, you can use a static field name instead of a dynamic one. It’s also important to ensure that the date values in your documents match the specified date format.

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This guide will help you check for common problems that cause the log ” invalid dynamic name expression [{}]. missing date format ” 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 [{}]. missing date format” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (inPlaceHolderString.lastIndexOf(RIGHT_BOUND) != inPlaceHolderString.length() - 1) {
 throw new ElasticsearchParseException("invalid dynamic name expression [{}]. missing closing `}`" +
 " for date math format"; inPlaceHolderString);
 if (dateTimeFormatLeftBoundIndex == inPlaceHolderString.length() - 2) {
 throw new ElasticsearchParseException("invalid dynamic name expression [{}]. missing date format";
 mathExpression = inPlaceHolderString.substring(0; dateTimeFormatLeftBoundIndex);
 String patternAndTZid =
 inPlaceHolderString.substring(dateTimeFormatLeftBoundIndex + 1; inPlaceHolderString.length() - 1);


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