showdoctor.load_doctor_controller_load:
  path: 'doctor/{doctor_id}'
  defaults:
    _controller: 'DrupalshowdoctorControllerLoadDoctorController::load'
    _title: 'load'
  requirements:
    _permission: 'access content'

class LoadDoctorController extends ControllerBase
{
    public function load($doctor_id)
    {
        $result = RestCurl::post("http://myrest_server.com", [
            'filter' => ['doctor.id' => $doctor_id],
        ]);

        $fullname = $result['data']->message->data[0]->firstName;
        $fullname = $fullname . ' ' . $result['data']->message->data[0]->lastName;
        // Fetch doctor node with EFQ
        $query = Drupal::entityQuery('node');
        $query->condition('type', 'doctor');
        $query->condition('field_doctor_id', $doctor_id);
        $nids = $query->execute();
        if (!$nids) {
            $node = Node::create([
                'type' => 'doctor',
                'title' => $fullname,
                'uid' => 1,
            ]);
            $node->set('field_doctor_id', $doctor_id);
            $node->save();
            $element = array(
                '#markup' => $node,
            );
            return $element;
        } else {
            $element = array(
                '#markup' => $node,
            );
            return $element;
        }
    }

}