docs: private void verifyNodeStarted() {
          NodeEngineImpl nodeEngine = (NodeEngineImpl) getNodeEngine();
          nodeStartCompleted = nodeEngine.getNode().getNodeExtension().isStartCompleted();
          if (!nodeStartCompleted) {
              throw new IllegalStateException("Migration operation is received before startup is completed. "
                      + "Sender: " + getCallerAddress());
          }
      }