public bool DoesCustomerResourceExist(Guid customerId)
        {
            var collectionUri = _documentDbHelper.CreateCustomerDocumentCollectionUri();

            var client = _databaseClient.CreateDocumentClient();

            if (client == null)
            {
                return(false);
            }

            var customerQuery = client.CreateDocumentQuery <Document>(collectionUri, new FeedOptions()
            {
                MaxItemCount = 1
            });

            return(customerQuery.Where(x => x.Id == customerId.ToString()).Select(x => x.Id).AsEnumerable().Any());
        }