public static SummaryField createWithUnresolvedType(String name, DocumentSummary owner) {
        // Data type is not available during conversion of
        // parsed schema to schema. Use a placeholder data type and tag the summary
        // field as having an unresolved type.
        var summaryField = new SummaryField(name, DataType.NONE, owner);
        summaryField.unresolvedType = true;
        return summaryField;
    }
Creates a summary field with NONE as transform
config-model/src/main/java/com/yahoo/vespa/documentmodel/SummaryField.java