code: @Override
    public Long zrem(final byte[] key, final byte[]... members) {
      checkIsInMultiOrPipeline();
      client.zrem(key, members);
      return client.getIntegerReply();
    }
docs: Remove the specified member from the sorted set value stored at key. If member was not a member
  of the set no operation is performed. If key does not not hold a set value an error is
  returned.
  <p>
  Time complexity O(log(N)) with N being the number of elements in the sorted set
  @param key
  @param members
  @return Integer reply, specifically: 1 if the new element was removed 0 if the new element was
  not a member of the set