/// <summary>
 /// Get a mongodb database by the name.
 /// </summary>
 /// <param name="database">Name of the database</param>
 /// <returns>MongoDB database instance or null if no database found</returns>
 /// <exception cref="ArgumentNullException">Thrown if database is null or empty</exception>
 public IMongoDatabase GetDatabase(string database)
 {
     return(_migrationManager.GetDatabase(database));
 }