I've indexed pdf's page by page. Now to maintain book(parent)-page(child) relationship what is the advantage of using joins?
Now, url of the book stored in file system is also one of the field in my mappings.
so, whenever user access a document, if he needs whole book I can return him the url.
Is this correct way of achieving it or have any dis-advantages? and adding parent-child relation will add any advantage like increase in performance or relevancy ?