code: public Long rankReverse(final String member) {
          return doWithJedis(new JedisCallable<Long>() {
              @Override
              public Long call(Jedis jedis) {
                  return jedis.zrevrank(getKey(), member);
              }
          });
      }
docs: Returns the rank of member in the sorted set, with the scores ordered from high to low.
  The rank (or index) is 0-based, which means that the member with the highest score has rank 0.
  @param member
  @return the reversed rank of member, or <code>null</code> if the member does not exist