When upgrading the MongoDB Node.js driver version from 3.6.3 to 3.6.4 I saw the change regarding top level usage of j (https://github.com/mongodb/node-mongodb-native/pull/2624). So, I updated my MongoClient constructor to use the new writeConcern map:

let mongodbClient = new MongoClient({
    useUnifiedTopology: true,
    useNewUrlParser: true,
    connectTimeoutMS: 10000,
    poolSize: 10,
    writeConcern: {
        j: true
    }
});

However, I am still seeing the following warning logged every time a write occurs:

Top-level use of w, wtimeout, j, and fsync is deprecated. Use writeConcern instead.

I should not be seeing this warning as I updated my MongoClient constructor to the new writeConcern object right?