$config['search_type'] is not correctly updated when updating from 3.0 to 3.1

The migrations \phpbb\db\migration\data\v310\namespaces takes care to update the search_type config if it is prefixed by phpbb_search_.
But in a fresh installation of Olympus, the search_type is set to 'fulltext_native' and so the config value is not updated to the correct value for Ascraeus ('\\phpbb\\search
fulltext_native')