I am trying to make API calls to search in a space that has a specific parent page that has approximately 8000 children. Under this parent, I want to find pages that have certain strings in their title using a partial string match in CQL. However, pages after a certain number (I think it is 500) do not appear to have the property "child of parent ID = X". If I remove the parent ID constraint I get the result I want, but also results I don't want that are children of other parent pages.
The children pages show the correct parent page when looking at the page hierarchy, and only do not appear to have the child relationship when using CQL queries.