How to use the dcicutils.ff_utils.purge_metadata function in dcicutils

gen_check_result = gen_check.get_primary_result()

    # Checks expire after 280 seconds, so keep track of how long this task has lasted.
    start_time = time.time()
    time_expired = False

    # Purge the deleted files.
    for view_conf_uuid in gen_check_result["full_output"]["items_to_purge"]:
        # If we've taken more than 270 seconds to complete, break immediately
        if time.time() - start_time > 270:
            time_expired = True
            break

        purge_response = {}
        try:
            purge_response = ff_utils.purge_metadata(view_conf_uuid, key=connection.ff_keys)
        except Exception as exc:
            purge_response['comment'] = str(exc)
        if purge_response.get('status') == 'success':
            action_logs['items_purged'].append(view_conf_uuid)
        else:
            action_logs['failed_to_purge'][view_conf_uuid] = purge_response['comment']

    action.status = 'DONE'
    action.output = action_logs
    return action

t0 = time.time()
    check.full_output = {}  # purged items by item type
    search = '/search/?type=TrackingItem&tracking_type=download_tracking&status=deleted&field=uuid&limit=300'
    search_res = ff_utils.search_metadata(search, key=connection.ff_keys)
    search_uuids = [res['uuid'] for res in search_res]
    client = es_utils.create_es_client(connection.ff_es, True)
    # a bit convoluted, but we want the frame=raw, which does not include uuid
    # use get_es_metadata to handle this. Use it as a generator
    for to_purge in ff_utils.get_es_metadata(search_uuids, es_client=client, is_generator=True,
                                             key=connection.ff_keys):
        if round(time.time() - t0, 2) > time_limit:
            break
        purge_properties = to_purge['properties']
        purge_properties['uuid'] = to_purge['uuid']  # add uuid to frame=raw
        try:
            purge_res = ff_utils.purge_metadata(to_purge['uuid'], key=connection.ff_keys)
        except Exception as exc:
            purge_status = 'error'
            purge_detail = str(exc)
        else:
            purge_status = purge_res['status']
            purge_detail = purge_properties if purge_status == 'success' else purge_res
        purge_record = {'uuid': to_purge['uuid'], 'result': purge_detail}
        if to_purge['item_type'] not in check.full_output:
            check.full_output[to_purge['item_type']] = {}
        if purge_status not in check.full_output[to_purge['item_type']]:
            check.full_output[to_purge['item_type']][purge_status] = []
        check.full_output[to_purge['item_type']][purge_status].append(purge_record)
    purge_out_str = '. '.join(['%s: %s' % (it, len(check.full_output[it]['success']))
                               for it in check.full_output if check.full_output[it].get('success')])
    check.description = 'Purged: ' + purge_out_str + '. Search used: %s' % search
    if any([it for it in check.full_output if check.full_output[it].get('error')]):