public void Filter_SetsCorrectTypeForString(string value)
        {
            var    service = _service.Filter(x => x.StringProperty, value) as ElasticSearchService <ComplexType>;
            Filter result  = service.PostFilters.Single(f => f.FieldName == "StringProperty");

            Assert.Equal(value, result.Value);
            Assert.Equal(typeof(String).Name, result.Type.Name);
        }