Call to a member function getPropertyDefinitions() on null in Drupal\search_api\Plugin\views

Kavya N N → changed the visibility of the branch search_api-3418665 to hidden.

Thanks for reporting this problem!

However, I have a couple of questions:

1. Are you certain the problem occurs during indexing? As it relates to Views code, I would have assumed it would occur during searching.
2. Even so, it seems pretty extraordinary that the Views plugin would not be able to determine the search index the whole view is based on, and this was the only place where this led to a problem. Can you determine in which view in particular this occurs (and why it would be executed during indexing)? Is it a Search API view?

Finally, testing issue forks unfortunately still doesn’t work in this project – see #3190024: Problem with test dependencies when testing issue forks → and 📌 (Try to) fix the GitLab CI RTBC for details. Therefore, we still have to work with patches for now.
Attaching a revision of your changes that seems a bit more elegant, considering we are free to use PHP 8.1.