"""
    This decorator is deprecated.
    In previous versions, all subclasses of BaseOperator must use apply_default decorator for the"
    `default_args` feature to work properly.
    In current version, it is optional. The decorator is applied automatically using the metaclass.
    """
    warnings.warn(
        "This decorator is deprecated. \n"
        "\n"
        "In previous versions, all subclasses of BaseOperator must use apply_default decorator for the "
        "`default_args` feature to work properly.\n"
        "\n"
        "In current version, it is optional. The decorator is applied automatically using the metaclass.\n",
        RemovedInAirflow3Warning,
        stacklevel=3,
    )
    
    @wraps(func)
    def wrapper(*args, **kwargs):