mongoc_bulk_operation_update_one()
Synopsis
void
mongoc_bulk_operation_update_one (mongoc_bulk_operation_t *bulk,
const bson_t *selector,
const bson_t *document,
bool upsert);This function queues an update as part of a bulk operation. It will only modify a single document on the MongoDB server. This function does not execute the operation. To execute the entirety of the bulk operation call mongoc_bulk_operation_execute().
document must only contain fields whose key starts with $. See the update document specification for more details.