Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

8.x.x

Node.js version

20.x.x

MongoDB server version

7.x

Typescript version (if applicable)

No response

Description

When having a sharded collection and having set shardKey on the schema, using buildBulkWriteOperations does not take the shardKey into account.

Steps to Reproduce

1. Enable shardKey option on schema:

const measurementSchema = new Schema({
  temperature: { type: Number },
  sensorId: { type: String },
}, { shardKey: { sensorId: 1 } });

when using running

// Assuming m is an existing document
m.temperature = 21.1

await Measurement.bulkWrite([m])

This will execute a bulkWrite without the shardKey as a part of the filter condition in the updateOne command of the bulkWrite.

While this current solution will work (as ObjectIds are universally unique), including the shardKey in update will enable the to the executed on a single shard.

Expected Behavior

No response