Expected behavior
Expected data type for column classId in table bundle_advancedobjectsearch_update_queue to be varchar as $classDefinition->getId() returns string.
Actual behavior
Data type is int.
Steps to reproduce
This is an issue when you use your own unique identifier on DataObject classes.

The issue can for example be seen below where $classDefinition->getId() is a string.
https://github.com/pimcore/advanced-object-search/blob/4.x/src/Service.php#L351