Adding more constructors in BasicDBObject would allow a more indented type of writing that resembles the JSON notation.
We use a DBO class like in https://bitbucket.org/davidmc24/mongo-java-aggregate/src/eb1f9884175254e13759ea61fdda40ded8a885a7/src/main/java/org/bitbucket/davidm24/mongodb/aggregate/DBO.java?at=default in all our projects.

(the same goes to DBList)