code: private void proxyPause() {
          logger.info("Pausing after cluster state has changed to allow proxy bridges to be established. "
                      + "Will start rebalancing work on servers in "
                      + proxyPauseSec
                      + " seconds.");
          try {
              Thread.sleep(TimeUnit.SECONDS.toMillis(proxyPauseSec));
          } catch(InterruptedException e) {
              logger.warn("Sleep interrupted in proxy pause.");
          }
      }
docs: Pause between cluster change in metadata and starting server rebalancing
  work.