code: @Override
      public boolean add(RedisClusterNode redisClusterNode) {
  
          synchronized (partitions) {
              LettuceAssert.notNull(redisClusterNode, "RedisClusterNode must not be null");
  
              boolean add = getPartitions().add(redisClusterNode);
              updateCache();
              return add;
          }
      }
docs: Adds the {@link RedisClusterNode} to this {@link Partitions}.
  
  @param redisClusterNode must not be {@literal null}
  @return {@literal true} if this {@link Partitions} changed as a result of the call