To many elements to index (#13868)

* To many elements to index

I don't know why in the query `#__tags` is twice. Once as a `a` and second time as a `b`. For me it works perfectly when we remove `b`. I had a problem with this - for 1100 tags on my websites, Smart Search Indexer found more than 1233000 items to index.

* Mistake with query

I corrected a bug with calling the `#__tags` table in the query.

plugins/finder/tags/tags.php

@@ -315,8 +315,7 @@ protected function getListQuery($query = null)
 
 		// Join the #__users table
 		$query->select('u.name AS author')
-			->join('LEFT', '#__users AS u ON u.id = b.created_user_id')
-			->from('#__tags AS b');
+			->join('LEFT', '#__users AS u ON u.id = a.created_user_id');
 
 		// Exclude the ROOT item
 		$query->where($db->quoteName('a.id') . ' > 1');