We only support AVG MEDIAN and SUM on number based fields – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when you’re trying to perform an operation like AVG, MEDIAN, or SUM on a field that is not number-based in OpenSearch. OpenSearch only supports these operations on numeric fields. To resolve this issue, you can either change the field type to a numeric one if it’s currently a different type, or use a different operation that is supported on the current field type. Alternatively, you could create a new numeric field and copy the values from the current field, then perform the operation on the new field.

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This guide will help you check for common problems that cause the log ” we only support AVG; MEDIAN and SUM on number based fields ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: sort, search.

Log Context

Log “we only support AVG; MEDIAN and SUM on number based fields” class name is FieldSortBuilder.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 boolean reverse = order == SortOrder.DESC;
 IndexFieldData fieldData = context.getForField(fieldType);
 if (fieldData instanceof IndexNumericFieldData == false
 && (sortMode == SortMode.SUM || sortMode == SortMode.AVG || sortMode == SortMode.MEDIAN)) {
 throw new QueryShardException(context; "we only support AVG; MEDIAN and SUM on number based fields");
 final SortField field;
 boolean isNanosecond = false;
 if (numericType != null) {
 if (fieldData instanceof IndexNumericFieldData == false) {


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