Dear,
On a new docker installation MW 1.39.1, PHP 8.1.15, MariaDB 10.10.2, Elastic Search 7.10.2 we get the following error with the AdvancedSearch extension enabled when doing a search:
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in var/www/html/extensions/AdvancedSearch/includes/MimeTypeConfigurator.php on line 49
When AdvancedSearch is disabled, the Elastic Search works properly.
Tom