AncestorID Search Does Not Search Comments of Child Pages

Steps To Reproduce

1. Create a Space With The Documentation Theme
2. Create a child page to the homepage, with a dummy title like "asd"
3. Create a comment in the page (created in step 2), with the content "foo"
4. Navigate back to the space's homepage, and search for "foo" from the searchbox in the left navigation box (Documentation Theme). The search automatically appends the ancestorId:

   ancestorIds:5177346 AND foo
   

   Notice that the comment cannot be found

5. Search again for "foo" with the regular Confluence search box at the top right corner. Notice that the comment can be found this time