private boolean isSupportedMultiValueField(ImmutableSDField sourceField) {
        var type = sourceField.getDataType();
        return (isArrayOfPrimitiveType(type) || isWeightedsetOfPrimitiveType(type));
    }
Iterates all summary fields with 'matched-elements-only' or 'select-elements-by' and validates that the field type is supported.

@author geirst
config-model/src/main/java/com/yahoo/schema/processing/SummaryElementsSelectorValidator.java