Epi Find Filter question

Hi Guys,

So i just can't get my filter expression to work with my query to filter on a boolean.

So i've simplified the query for now. I have a q term which returns 9 results. 

My SitePageData (which is my basepage in my Site which is a Pagedata) has a NoIndex (boolean) property. 

Now i want to filter the pages which that has NoIndex set to true on the page, but with the below filterexpression i cannot get this to work. 

var results = SearchClient.Instance.UnifiedSearchFor(q)               
                .Filter(x => ((SitePageData)x).NoIndexFilters())                
                .GetResult();

 public static FilterExpression<SitePageData> NoIndexFilters(this SitePageData sitePageData)
        {
            return new FilterExpression<SitePageData>(x =>
                x.NoIndex.Match(true));
        }

If i set the Match to true i just get all 9 results back.. if i set it to false, i get 0 results, which is just weird. Am i not using this correctly. 

Just to check if stuff is working i changed the filter to just return pages of type ContentPages. And that seems to be working. Because out of my 9 pages, i get 3 back which are all of ContentPages. So this works, but my filter on the NoIndex Boolean doesnt. 

  public static FilterExpression<SitePageData> NoIndexFilters(this SitePageData sitePageData)
        {
            return new FilterExpression<SitePageData>(x =>
                x.MatchTypeHierarchy(typeof(ContentPage)));
        }

Any insight would be helpful..

regards,