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);
}