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);
}