code: public long remove(final String... fields) {
          return doWithJedis(new JedisCallable<Long>() {
              @Override
              public Long call(Jedis jedis) {
                  return jedis.hdel(getKey(), fields);
              }
          });
      }
docs: Remove multiple fields from the map
  @param fields the fields to remove
  @return the number of fields removed