docs: public void unregister(ZKMBeanInfo bean) {
          if(bean==null)
              return;
          String path=mapBean2Path.get(bean);
          try {
              unregister(path,bean);
          }
          catch (InstanceNotFoundException e) {
              LOG.warn("InstanceNotFoundException during unregister usually means more than one Zookeeper server has been running in a single JVM");
              LOG.warn("InstanceNotFoundException during unregister can be safely ignored during automated tests.");
          }
          catch (JMException e) {
              LOG.warn("Error during unregister", e);
          }
          mapBean2Path.remove(bean);
          mapName2Bean.remove(bean.getName());
      }