@classmethod
def add_params(cls, cmdline_parser):
    """ Shared params in all backends """
    parser = cmdline_parser
    parser.add_argument('-e', '--elastic_url', default=
        'http://127.0.0.1:9200', help=
        'Host with elastic search (default: http://127.0.0.1:9200)')
    parser.add_argument('--elastic_url-enrich', help=
        'Host with elastic search and enriched indexes')
