function createInstance() {
    const bigtable = new Bigtable();
    const instance = bigtable.instance('test-instance');
    const instanceOptions = {
        clusters: [
            {
                nodes: 3,
                location: 'us-central1-f',
                storage: 'ssd',
            }
        ],
        labels: { 'prod-label': 'prod-label' },
    };
    instance.create(instanceOptions, (err, response) => {
        if (err) {
            console.log(err);
        }
        console.log(`Created Instance successfully.`);
    });
}