diff --git a/src/Annotation/FacetsFacetSource.php b/src/Annotation/FacetsFacetSource.php
index a43f580..f9ad93d 100644
--- a/src/Annotation/FacetsFacetSource.php
+++ b/src/Annotation/FacetsFacetSource.php
@@ -41,4 +41,11 @@ class FacetsFacetSource extends Plugin {
    */
   public $description;
 
+  /**
+   * The id of the search api display, if one is used.
+   *
+   * @var string
+   */
+  public $display_id;
+
 }
diff --git a/src/Plugin/facets/facet_source/SearchApiDisplay.php b/src/Plugin/facets/facet_source/SearchApiDisplay.php
index a483157..0cda62b 100644
--- a/src/Plugin/facets/facet_source/SearchApiDisplay.php
+++ b/src/Plugin/facets/facet_source/SearchApiDisplay.php
@@ -139,9 +139,10 @@ class SearchApiDisplay extends FacetSourcePluginBase {
     // If there are no results, we can check the Search API Display plugin has
     // configuration for views. If that configuration exists, we can execute
     // that view and try to use it's results.
-    if ($results === NULL && isset($this->getDisplay()->getPluginDefinition()['view_id'])) {
-      $view = Views::getView($this->getDisplay()->getPluginDefinition()['view_id']);
-      $view->setDisplay($this->getDisplay()->getPluginDefinition()['view_display']);
+    $display_definition = $this->getDisplay()->getPluginDefinition();
+    if ($results === NULL && isset($display_definition['view_id'])) {
+      $view = Views::getView($display_definition['view_id']);
+      $view->setDisplay($display_definition['view_display']);
       $view->execute();
       $results = $this->searchApiQueryHelper->getResults($search_id);
     }
@@ -262,7 +263,7 @@ class SearchApiDisplay extends FacetSourcePluginBase {
    *
    * @see hook_facets_search_api_query_type_mapping_alter()
    */
-  public function getQueryTypesForDataType(BackendInterface $backend, $data_type_plugin_id) {
+  protected function getQueryTypesForDataType(BackendInterface $backend, $data_type_plugin_id) {
     $query_types = [];
     $query_types['string'] = 'search_api_string';