Do you guys have any whitepapers/engineering blog posts about using MongoDB? I'd really like some engineering insights into what access patterns are used in mod

Do you guys have any whitepapers/engineering blog posts about using MongoDB? I'd really like some engineering insights into what access patterns are used in modern MongoDB based systems. Also, regarding ES, its easy to see how each system prioritizes things. For me if I had to design a system today I'd use MongoDB as the main OLTP database, use ES for search (with regular jobs syncing data between Mongo and ES), and use Hadoop/Spark for analytics. Mongo is decent for OLAP loads but there's no point running OLAP queries on production OLTP stores.