code: @Override
      public Set<byte[]> slKeys(byte[] key, byte[] field) {
          try {
              if (isPipelined()) {
                  pipeline(new JedisResult(pipeline.slkeys(key, field)));
                  return null;
              }
  
              return this.client.slkeys(key, field);
          } catch (Exception ex) {
              throw convertException(ex);
          }
      }
docs: /*
  @see RedisSessionOfHashListCommands#slKeys(byte[], byte[])