Using an extension method is the way to go. The method will not be called, instead it's translated into a filter that will be executed on the index. E.g.:

var query = this.client.UnfiedSearchFor("bananas")
    .Filter(x => x.MyExtensionMethod().Match("Monkey"))
    .GetResult();

In this case the logic in MyExtensionMethod will not be executed.

Just to clarify even further... What you pass in the filter is an expression and not a function that will be invoked. The expression is then translated into filters that Find/Elastic understands.

Hello Johan,

Is there a way to access the values after the find query has returned a list of the results. For example, if I have a URL indexed as an extra property, is there a way to access that and return it in an API call after the find query has returned the results?

Thanks for your example!

What type of objects are you indexing? Why not add the URL as a property on that object then?

If you're searching for Episerver content, there is no nice way to get the value from the index since Find will only retrieve the ContentReference and then get the actual data from Episerver's IContentLoader, so then you have to call your extension method again.

If you're using UnfiedSearch there is already a metadata dictionary on UnifiedSearchHit where you can add custom data and also filter on.