I am working through some problems and have come across one which I think I understand, however I’d like to ensure so. The question is about building a search engine for crawled documents where we downloaded the title, abstract and main body. We want it to be fast, and we have virtually infinite disk space at low costs. Hence, should we use doc values, inverted indexes, or a mixture of both (ex. doc values for title and inverted index for rest of fields).