The facade to trigger the whole JDBC flow. Internally:

• should have lifecycle integration (so internal Mongo resource like MongoDB, MongoClient could be managed automatically; could tap into Hibernate's feature)
• create MongoClient internally (customizing its MongoClientSetting is out of scope; another sub-task at https://jira.mongodb.org/browse/HIBERNATE-28 focuses on that)
• create MongoDB internally
• Connection creation is out of scope (in https://jira.mongodb.org/browse/HIBERNATE-10)
• unit testing code not mandatory, but any verification mechanism is desirable