TASK: Lower severity of one more log message

If the `NodeData` of a node cannot be loaded, this isn't really an error,
as the comment in the code even indicates.

Author: kdambekalns

Classes/IndexingJob.php

@@ -30,7 +30,7 @@ public function execute(QueueInterface $queue, Message $message)
 
                 // Skip this iteration if the nodedata can not be fetched (deleted node)
                 if (!$nodeData instanceof NodeData) {
-                    $this->log(sprintf('action=indexing step=failed node=%s message="Node data could not be loaded"', $node['identifier']), \LOG_ERR);
+                    $this->log(sprintf('action=indexing step=failed node=%s message="Node data could not be loaded"', $node['identifier']), \LOG_WARNING);
                     continue;
                 }