docs: public void close() {
          Iterator<SocketDestination> it = getStatsMap().keySet().iterator();
          while(it.hasNext()) {
              try {
                  SocketDestination destination = it.next();
                  JmxUtils.unregisterMbean(JmxUtils.createObjectName(JmxUtils.getPackageName(ClientRequestExecutor.class),
                                                                     "stats_"
                                                                             + destination.toString()
                                                                                          .replace(':',
                                                                                                   '_')
                                                                             + identifierString));
              } catch(Exception e) {}
          }
      }