We have some custom object in our index, for example contact persons that does not have any EpiServer page. We index them with a schedule job that updates the index and that is working great but I can't get a good delete-part to work.

I wan't to do something like this

List<string> Ids = existingIds;
client.Delete<ContactPerson>(x=> !ids.Contains(x.Id))
But I can't use Contains and when I try with Match
client.Delete<ContactPerson>(x=> !ids.Match(x.Id))
It says that i can't compare.

I got it to work by do a search for all ContactPersons like this

public void DeleteExtraContats(List<string> ids)
{
var client = Client.CreateFromConfig();
var result = client.Search<ContactPersonToIndex>().Take(0).GetResult().TotalMatching;
var items = client.Search<ContactPersonToIndex>().Skip(0).Take(result).GetResult();

foreach (var item in items.Where(item => !ids.Contains(item.Id)))
{
client.Delete<ContactPersonToIndex>(item.Id);
}

}

But it does not feel efficient and there must be a better way to do it.