Site search doesn't search all pages

I’m in the process of upgrading my site from v6 to v8. Everything seems to be working as expected, except for the search page. There are a number of sub-pages that are not being searched on the new site. For example, if you were to search the term ‘beetle’ on the old search page ( :: Search) you will see a number of results. But if you search the same term on the new site ( it does not show results from any of the sub-pages.

Have you run the search index jobs? Also go to those pages and check they have not been excluded from the search.

that was it! many thanks!