feat(model): allow passing `options to bulkSave() for sessions an…

…d writeconcerns

Fix #11127

lib/model.js

@@ -3597,16 +3597,21 @@ Model.bulkWrite = function(ops, options, callback) {
  * `bulkSave` uses `bulkWrite` under the hood, so it's mostly useful when dealing with many documents (10K+)
  *
  * @param {[Document]} documents
+ * @param {Object} [options] options passed to the underlying `bulkWrite()`
+ * @param {ClientSession} [options.session=null] The session associated with this bulk write. See [transactions docs](/docs/transactions.html).
+ * @param {String|number} [options.w=1] The [write concern](https://docs.mongodb.com/manual/reference/write-concern/). See [`Query#w()`](/docs/api.html#query_Query-w) for more information.
+ * @param {number} [options.wtimeout=null] The [write concern timeout](https://docs.mongodb.com/manual/reference/write-concern/#wtimeout).
+ * @param {Boolean} [options.j=true] If false, disable [journal acknowledgement](https://docs.mongodb.com/manual/reference/write-concern/#j-option)
  *
  */
-Model.bulkSave = function(documents) {
+Model.bulkSave = function(documents, options) {
   const preSavePromises = documents.map(buildPreSavePromise);
 
   const writeOperations = this.buildBulkWriteOperations(documents, { skipValidation: true });
 
   let bulkWriteResultPromise;
   return Promise.all(preSavePromises)
-    .then(() => bulkWriteResultPromise = this.bulkWrite(writeOperations))
+    .then(() => bulkWriteResultPromise = this.bulkWrite(writeOperations, options))
     .then(() => documents.map(buildSuccessfulWriteHandlerPromise))
     .then(() => bulkWriteResultPromise)
     .catch((err) => {