docs: public void shutdownWork(String workUnit, boolean doLog /*true*/ ) {
          if (doLog) {
              LOG.info("Shutting down {}: {}...", config.workUnitName, workUnit);
          }
          myWorkUnits.remove(workUnit);
          claimedForHandoff.remove(workUnit);
          balancingPolicy.onShutdownWork(workUnit);
          try {
              listener.shutdownWork(workUnit);
          } finally {
              ZKUtils.deleteAtomic(zk, workUnitClaimPath(workUnit), myNodeID);
          }
      }