fix(NODE-5636): generate _ids using pkFactory in bulk write operations

[baileympearson]

Description

What is changing?

Bulk operations now generate _ids for inserted documents using the pkFactory, if the user has provided one.

Is there new documentation needed for these changes?

No.

What is the motivation for this change?

Release Highlight

Bulk Write Operations Generate Ids using pkFactory

When performing inserts, the driver automatically generates _ids for each document if there is no _id present. By default, the driver generates ObjectIds. An option, pkFactory, can be used to configure the driver to generate _ids that are not object ids.

For a long time, only Collection.insert and Collection.insertMany actually used the pkFactory, if configured. Notably, Collection.bulkWrite(), Collection.initializeOrderedBulkOp() and Collection.initializeOrderedBulkOp() always generated ObjectIds, regardless of what was configured on collection.

The driver always generates _ids for inserted documents using the pkFactory.

Caution

If you are using a pkFactory and performing bulk writes, you may have inserted data into your database that does not have _ids generated by the pkFactory.

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[nbbeeken]

Nice work, a few tiny cleanups