def _add_no_underscore_compatibility(classes):
    """ Add class names without underscores for compatibility.

    Previously, no resources had underscores in APIClient.  Parsing of
    resources has been fixed so now these resources will have underscores.
    This adds an extra class for those resources without an underscore
    for compatibility. Additionally, this removes the resource "feature_flags"
    as APIClient has a name collision with this resource. This will
    be removed in v2.0.0.
    """
    new = ['bocce_clusters', 'match_targets', 'remote_hosts', 'feature_flags']
    classes_ = {}
    class_names = list(classes.keys())
    for class_name in class_names:
        if class_name != 'feature_flags':
            classes_[class_name] = classes[class_name]
        if class_name in new:
            class_name_no_us = ''.join(class_name.split('_'))
            classes_[class_name_no_us] = classes[class_name]
    return classes_
