Incorporated changes from the 3396064-gitlab branch by Claudiu Cristea.

css/search_api.admin.css

.../search_api_db/src/Plugin/search_api/backend/Database.php

src/IndexListBuilder.php

src/Plugin/views/field/SearchApiBulkForm.php

src/Utility/DeprecationHelper.php

...ules/search_api_test_db/search_api_test_db.search_api.inc

tests/modules/search_api_test_db/src/EventListener.php

...i_test_excerpt_field/search_api_test_excerpt_field.module

..._excerpt_field/search_api_test_excerpt_field.services.yml

...dules/search_api_test_excerpt_field/src/EventListener.php

...odules/search_api_test_hooks/search_api_test_hooks.module

...earch_api_test_hooks/search_api_test_hooks.search_api.inc

.../search_api_test_hooks/search_api_test_hooks.services.yml

tests/modules/search_api_test_hooks/src/EventListener.php

...odules/search_api_test_views/search_api_test_views.module

tests/modules/search_api_test_views/src/EventListener.php

tests/src/Functional/CacheabilityTest.php

tests/src/Kernel/LocalTasksTest.php

tests/src/Kernel/Views/ViewsPropertyExtractionTest.php