Must be set for date fields – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when a date field in Elasticsearch is not properly configured with a format. Elasticsearch requires a specific format to understand and index date fields correctly. To resolve this issue, you can specify the format of the date field in the mapping. For example, you can use “format”: “yyyy-MM-dd” for a date like “2022-01-01”. Alternatively, if the date format is not consistent, you can use multiple formats like “format”: “yyyy-MM-dd||epoch_millis”. This will allow Elasticsearch to interpret the date correctly.

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This guide will help you check for common problems that cause the log ” [{}] must be set for date fields. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “[{}] must be set for date fields.” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 origin = ((DateFieldMapper.DateFieldType) dateFieldType).parseToLong(originString; false; null; null; context::nowInMillis);
 }  if (scaleString == null) {
 throw new ElasticsearchParseException("[{}] must be set for date fields."; DecayFunctionBuilder.SCALE);
 TimeValue val = TimeValue.parseTimeValue(
 DecayFunctionParser.class.getSimpleName() + ".scale"


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