writes.cs

    public class TestItem
    {
        public long A, B;
    }

    public static class Program
    {
        public static async Task Main(string[] args)
        {
            using (var store = new DocumentStore
            {
                Urls = new[] { "http://localhost:8080" },
                Database = "test"
            })
            {
                store.Initialize();

                var sp = Stopwatch.StartNew();
                using (var bulk = store.BulkInsert())
                {
                    for (int i = 0; i < 10_000_000; i++)
                    {
                        var t = bulk.StoreAsync(new TestItem
                        {
                            A = i,
                            B = i
                        });
                        if (t.IsCompleted)
                            continue;
                        await t;
                    }
                }
                Console.WriteLine(sp.ElapsedMilliseconds);
            }
        }
    }