@Override
    public void write(ClearValueUpdate clearValueUpdate, DataType superType) {
        //TODO: This has never ever been implemented. Has this ever worked?
    }
Write out the value of weighted set field

@param field - field description (name and data type)
@param ws    - field value
document/src/main/java/com/yahoo/document/serialization/VespaDocumentSerializer6.java