def METHOD_NAME(self):
    """Allows to get fields_eig_1 output of the operator
    Returns
    ----------
    my_fields_eig_1 : FieldsContainer
    Examples
    --------
    >>> from ansys.dpf import core as dpf
    >>> op = dpf.operators.invariant.principal_invariants_fc()
    >>> # Connect inputs : op.inputs. ...
    >>> result_fields_eig_1 = op.outputs.fields_eig_1()
    """  # noqa: E501
    return self._fields_eig_1