code: public static void assertServerNotInRebalancingState(AdminClient adminClient, Integer nodeId) {
          assertServerNotInRebalancingState(adminClient, Lists.newArrayList(new Integer[]{nodeId}));
      }
docs: Utility function that checks the execution state of the server by
  checking the state of {@link VoldemortState} <br>
  
  This function checks if the nodes are not in rebalancing state (
  {@link VoldemortState#REBALANCING_MASTER_SERVER}).
  
  @param adminClient An instance of AdminClient points to given cluster
  @param nodeId Node id to be checked
  @throws VoldemortException if any node is in rebalancing state