/**
  * {@inheritdoc}
  */
 public function validateForm(array &$form, FormStateInterface $form_state)
 {
     parent::validateForm($form, $form_state);
     // Ensure each path is unique.
     $path = $this->entityQuery->get('search_page')->condition('path', $form_state->getValue('path'))->condition('id', $form_state->getValue('id'), '<>')->execute();
     if ($path) {
         $form_state->setErrorByName('path', $this->t('The search page path must be unique.'));
     }
     if ($this->plugin instanceof PluginFormInterface) {
         $this->plugin->validateConfigurationForm($form, $form_state);
     }
 }
 /**
  * {@inheritdoc}
  */
 public function validate(array $form, array &$form_state)
 {
     parent::validate($form, $form_state);
     // Ensure each path is unique.
     $path = $this->entityQuery->get('search_page')->condition('path', $form_state['values']['path'])->condition('id', $form_state['values']['id'], '<>')->execute();
     if ($path) {
         $this->setFormError('path', $form_state, $this->t('The search page path must be unique.'));
     }
     if ($this->plugin instanceof PluginFormInterface) {
         $this->plugin->validateConfigurationForm($form, $form_state);
     }
 }