public void Alter(AutoPersistenceModel model)
        {
            var methods = model.GetType().GetMethods();
            var method  = methods.Single(x => x.Name == "Override" && x.GetGenericArguments().Any());

            foreach (var type in _hasDocumentsIndexes)
            {
                // model.Override<{TIndex}>()
                var genericMethod = method.MakeGenericMethod(type);

                var alterationType = typeof(AlterationHelper <>).MakeGenericType(type);
                var overrideMethod = alterationType.GetMethods().Single(x => x.Name == "Override");
                var alteration     = overrideMethod.Invoke(null, null);

                genericMethod.Invoke(model, new[] { alteration });
            }

            // automatically creates a database index on properties with the [Indexed] attribute
            model.Conventions.Setup(s => s.Add <IndexedPropertyConvention>());

            // configure the size of the column
            model.Conventions.Setup(s => s.Add <StringColumnLengthConvention>());
        }