adjust event we listen for

src/Event/SolrDocumentAlterSubscriber.php

@@ -5,7 +5,7 @@ namespace Drupal\roblib_alter_solr;
 use Drupal\search_api\IndexInterface;
 use Drupal\search_api\Item\ItemInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Drupal\search_api_solr\Event\SolrDocumentAlterEvent;
+use Drupal\search_api_solr\Event\SearchApiSolrEvents;
 
 /**
  * Provides a Solr document alter event subscriber.
@@ -15,9 +15,10 @@ class SolrDocumentAlterSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
-    $events[SolrDocumentAlterEvent::class][] = ['alterSolrDocument', 800]; // Priority 800 (adjust as needed)
-    return $events;
+  public static function getSubscribedEvents(): array {
+    return [
+      SearchApiSolrEvents::POST_CREATE_INDEX_DOCUMENT => 'alterSolrDocument',
+    ];
   }
 
   /**