default boolean balance() throws IOException {
    return balance(BalanceRequest.defaultInstance()).isBalancerRan();
  }
Invoke the balancer. Will run the balancer and if regions to move, it will go ahead and do the
reassignments. Can NOT run for various reasons. Check logs.
@return <code>true</code> if balancer ran, <code>false</code> otherwise.
@throws IOException if a remote or network exception occurs
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java