private void CreateIndex(AsyncClient client, Arguments args, string indexName, string binName)
        {
            console.Info("Create index: ns=" + args.ns + " set=" + args.set + " index=" + indexName + " bin=" + binName);

            Policy policy = new Policy();
            policy.timeout = 0; // Do not timeout on index create.
            IndexTask task = client.CreateIndex(policy, args.ns, args.set, indexName, binName, IndexType.NUMERIC);
            task.Wait();
        }