minor: return an error if bulk_write is called on an unsupported server

[isabelatkinson]

Attempting to call bulk_write on a 7.0 server currently yields the following error:

Error: Error { kind: Command(CommandError { code: 40415, code_name: "Location40415", message: "BSON field 'bulkWrite.errorsOnly' is an unknown field.", topology_version: None }), labels: {}, wire_version: Some(21), source: None }

This PR adds a more informative error to avoid confusion if/when users attempt to use this feature with 7.0.

This is a temporary fix; once the server error is improved, we can remove this check (SERVER-91171).

[msf]

I just hit this issue and I'm puzzled, because I'm certain that bulk_write or db.collection.bulkWrite() works on v7 (and according to the docs even older versions).

For example, here is this command working in v7.0:

test> db.test.bulkWrite([ {replaceOne:{ "filter": {"_id": "1"}, "replacement": { "foo":"bar"}, "upsert":true}}])
{
  acknowledged: true,
  insertedCount: 0,
  insertedIds: {},
  matchedCount: 0,
  modifiedCount: 0,
  deletedCount: 0,
  upsertedCount: 1,
  upsertedIds: { '0': '1' }
}
test> db.test.bulkWrite([ {replaceOne:{ "filter": {"_id": "1"}, "replacement": { "foo":"ballla"}, "upsert":true}}])
{
  acknowledged: true,
  insertedCount: 0,
  insertedIds: {},
  matchedCount: 1,
  modifiedCount: 1,
  deletedCount: 0,
  upsertedCount: 0,
  upsertedIds: {}
}
test> db.test.bulkWrite([ {replaceOne:{ "filter": {"_id": "2"}, "replacement": { "foo":"balla"}, "upsert":true}}])
{
  acknowledged: true,
  insertedCount: 0,
  insertedIds: {},
  matchedCount: 0,
  modifiedCount: 0,
  deletedCount: 0,
  upsertedCount: 1,
  upsertedIds: { '0': '2' }
}
test> quit;
root@d545ed1cbbd0:/# mongosh
Current Mongosh Log ID:	66e461290c4124dc2cc76a8a
Connecting to:		mongodb://127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000&appName=mongosh+2.3.0
Using MongoDB:		7.0.14

[isabelatkinson]

Hi @msf, db.collection.bulkWrite() is a different API from client.bulkWrite(). The client-level method uses the new bulkWrite server command, which is only supported on MongoDB 8.0+. The driver only supports the client-level API.

[msf]

Is there a collection.bulkWrite api on the rust mongodb driver? I didnt find it

Thanks for your reply!

[isabelatkinson]

The Rust driver does not support the collection-level bulk write method.