A custom Drupal module that allows an administrator to exclude bundles (aka Content Types) from the Search results.

1. Download the module to your custom modules directory at /web/modules/custom.
2. Go to the Modules page at /admin/modules.
3. In the module list, find the "Exclude Bundles" module, select its checkbox and click Install.
4. Go to the module administration page at /admin/config/search/bundles and check the Content Types that you want to exlude from the search results.
5. Click Save.
6. Clear caches.

Search by Content Type in Drupal 8 - a custom module tutorial by Mike Purvis.