code: public void removeServerFromCache(long serverId) {
          servers.computeIfPresent(serverId, (key, server) -> {
              ((Cleanupable) server).cleanup();
              return null;
          });
          nonReadyServers.computeIfPresent(serverId, (key, server) -> {
              ((Cleanupable) server).cleanup();
              return null;
          });
      }
docs: Removes the given server from the cache.
  
  @param serverId The id of the server to remove.