Unable to find a field mapper for field field No missing value defined – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to find a field mapper for a specified field. This could be due to the field not existing in the index or the field name being misspelled. To resolve this issue, you can check if the field exists in the index and if the field name is spelled correctly. If the field doesn’t exist, you may need to add it to the index. If a ‘missing’ value is not defined, you can define it to handle cases where the field is not present in a document.

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This guide will help you check for common problems that cause the log ” Unable to find a field mapper for field [” + field + “]. No ‘missing’ value defined. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “Unable to find a field mapper for field [” + field + “]. No ‘missing’ value defined.” class name is FieldValueFactorFunctionBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 IndexNumericFieldData fieldData = null;
 if (context.isFieldMapped(field)) {
 fieldData = context.getForField(context.getFieldType(field); MappedFieldType.FielddataOperation.SEARCH);
 } else {
 if (missing == null) {
 throw new ElasticsearchException("Unable to find a field mapper for field [" + field + "]. No 'missing' value defined.");
 return new FieldValueFactorFunction(field; factor; modifier; missing; fieldData);


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