code: def delete(self, file_id):
          
          res = self._files.delete_one({"_id": file_id})
          self._chunks.delete_many({"files_id": file_id})
          if not res.deleted_count:
              raise NoFile(
                  "no file could be deleted because none matched %s" % file_id)
docs: Given an file_id, delete this stored file's files collection document
          and associated chunks from a GridFS bucket.
  
          For example::
  
            my_db = MongoClient().test
            fs = GridFSBucket(my_db)
            # Get _id of file to delete
            file_id = fs.upload_from_stream("test_file", "data I want to store!")
            fs.delete(file_id)
  
          Raises :exc:`~gridfs.errors.NoFile` if no file with file_id exists.
  
          :Parameters:
            - `file_id`: The _id of the file to be deleted.