When creating a view for Search API, it does not allow you to filter search results by the domain when you have multiple domains on your site. How can I add a Domain Access field to allow filtering search results. I am aware two sandboxes which may help (see below). It will be great to have a solution within the module itself not as a sandbox.

https://drupal.org/sandbox/raf/2244229
https://www.drupal.org/sandbox/svendecabooter/2010206

Many thanks,