code: function deleteMany(coll, filter, options, callback) {
    options.single = false;
  
    removeDocuments(coll, filter, options, (err, r) => deleteCallback(err, r, callback));
  }
docs: Delete multiple documents from the collection.
  
  @method
  @param {Collection} a Collection instance.
  @param {object} filter The Filter used to select the documents to remove
  @param {object} [options] Optional settings. See Collection.prototype.deleteMany for a list of options.
  @param {Collection~deleteWriteOpCallback} [callback] The command result callback