Converting from mongodb-driver-legacy to mongodb-driver-sync

Working with Data Drivers
1

I am trying to convert our application from using legacy driver to using sync driver with minimal changes. Obviously some of these may call for more changes, but wanted to determine replacement classes and methods for the following:

Classes:

com.mongodb.AggregationOptions;
com.mongodb.CommandResult;
com.mongodb.MapReduceCommand;
com.mongodb.MapReduceOutput;

Previous methods:

com.mongodb.DB.collectionExists
com.mongodb.DB.createCollection(String collectionName, DBObject options)

com.mongodb.DBCollection.insert(DBObject[] documents, WriteConcern writeConcern)
com.mongodb.DBCollection.setWriteConcern
com.mongodb.DBCollection.findAndRemove
com.mongodb.DBCollection.getName
com.mongodb.DBCollection.getStats

com.mongodb.DBCursor.next