/// <summary>
 /// Renames a GridFS file.
 /// </summary>
 /// <param name="id">The file id.</param>
 /// <param name="newFilename">The new filename.</param>
 /// <param name="cancellationToken">The cancellation token.</param>
 /// <returns>A Task.</returns>
 public Task RenameAsync(BsonValue id, string newFilename, CancellationToken cancellationToken = default(CancellationToken))
 {
     return(_bsonValueBucket.RenameAsync(id, newFilename, cancellationToken));
 }