public IDocumentBulkBuilder UpdateMany(Action <IDocumentUpdateBuilder> update, Func <IDocumentFilterBuilder, object> filter = null, bool insertIfNotExists = false) { _operations.Add(new UpdateManyModel <DynamicWrapper>(_filterBuilder.CreateMongoFilter(filter), MongoDocumentUpdateBuilder <DynamicWrapper> .CreateMongoUpdate(update)) { IsUpsert = insertIfNotExists }); return(this); }