code: @Deprecated
      public DatastoreImpl copy(final String database) {
          return new DatastoreImpl(morphia, mapper, mongoClient, database);
      }
docs: Creates a copy of this Datastore and all its configuration but with a new database
  
  @param database the new database to use for operations
  @return the new Datastore instance
  @deprecated use {@link Morphia#createDatastore(MongoClient, Mapper, String)}