I try to delete a file that stored in gridfs, but the file is not deleted immediately.
I think there is write concern in mongodb, so I want to set options {:w=>1} in delete method.
But in Ruby driver, there is no way to set options in delete method:
https://github.com/mongodb/mongo-ruby-driver/blob/master/lib/mongo/grid/fs_bucket.rb#L183

https://github.com/mongodb/mongo-ruby-driver/blob/e8d458cfc47d6d31320e19be49b47c85be334a1b/lib/mongo/collection.rb#L375