docs: public synchronized void closeImmediatedly() {
  
          close();
  
          Iterator iterator = this.connectionsInUse.iterator();
  
          while (iterator.hasNext()) {
              PooledConnection connection = (PooledConnection) iterator.next();
              SessionConnectionWrapper sessionWrapper =
                  (SessionConnectionWrapper) this.sessionConnectionWrappers.get(
                      connection);
  
              closeSessionWrapper(
                  sessionWrapper,
                  "Error closing session wrapper. Connection pool was shutdown immediatedly.");
          }
      }