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// Creates a filter for all documents that have a
// "borough" value of "Brooklyn"
var filter = Builders<Restaurant>.Filter
    .Eq(r => r.Borough, "Brooklyn");
// Asynchronously deletes all documents that match the filter
return await _restaurantsCollection.DeleteManyAsync(filter);

// Creates a filter for all documents that have a
// "borough" value of "Brooklyn"
var filter = Builders<Restaurant>.Filter
    .Eq(r => r.Borough, "Brooklyn");
// Deletes all documents that match the filter
return _restaurantsCollection.DeleteMany(filter);