private async Task EnsureIndicesCreatedImplAsync()
{
var tasks = new[]
{
_usersRepositoryManager.EnsureIndexAsync(o => o.Email.Value, false, true, false),
_usersRepositoryManager.EnsureIndexAsync(new [] { "Logins.LoginProvider", "Logins.ProviderKey" }, false, true, true)
};
await Task.WhenAll(tasks).ConfigureAwait(false);
}