(self, docnum, fieldname, default=0)
Returns the number of terms in the given field in the given
        document. This is used by some scoring algorithms.
Returns the number of terms in the given field in the given
        document. This is used by some scoring algorithms.
Returns the number of terms in the given field in the given document . This is used by some scoring algorithms .
def doc_field_length(self, docnum, fieldname, default=0):
        """Returns the number of terms in the given field in the given
        document. This is used by some scoring algorithms.
        """
        raise NotImplementedError
def doc_field_length ( self , docnum , fieldname , default = 0 ) : raise NotImplementedError