code: public void stopInstance(String instanceId, boolean forceStop) {
          this.stopInstance(new StopInstanceRequest()
                  .withInstanceId(instanceId).withForceStop(forceStop));
      }
docs: Stopping the instance owned by the user.
  
  You can stop the instance only when the instance is Running,
  otherwise,it's will get <code>409</code> errorCode.
  
  This is an asynchronous interface,
  you can get the latest status by invoke {@link #getInstance(GetInstanceRequest)}
  
  @param instanceId The id of the instance.
  @param forceStop The optional parameter to stop the instance forcibly.If <code>true</code>,
  it will stop the instance just like power off immediately
  and it may result in losing important data which have not been written to disk.