private Morphia morphia;
private MongoClient mongoClient;

morphia = new Morphia();
// Person is an entity object with Morphia annotations
morphia.map(Person.class);

// THESE properties MUST be read from environment variables in Spring BOOT.
final String host = "localhost";
final int port = 27017;

mongoClient = new MongoClient(host, port);

//Set database
// this instance would be autowired all data access classes
Datastore ds  = morphia.createDatastore(mongoClient, "dataStoreInstanceId");

// this is how instance would be used in those data accesses classes
Person p = ds.find(Person.class, "username", "john").get();