I'm trying to create a search index to get all doucment (within the given document type aliases) where any of the fields (given in the comma separated string) contains the search terms. I'm doing this with the following code:

 ISearcher searcher = index.GetSearcher();

                IQuery criteria = searcher.CreateQuery("content", BooleanOperation.And);

                IBooleanOperation query = criteria.GroupedNot(new string[] { "searchDisabled" }, new string[] { "1" });

                string searchFields = "nodeName,pageTitle,pageSummary,body,seoMetaDescription,seoMetaTitle,bottomGridSection,blogPostCategories";

                if (terms != null && terms.Any())
                    query.And(q => q.GroupedOr(searchFields.Split(','), terms.ToArray()), BooleanOperation.Or);

                if (docTypeAliases != null && docTypeAliases.Any())
                    query.And(q => q.GroupedOr(new[] { "__NodeTypeAlias" }, docTypeAliases));

                ISearchResults allResults = query.Execute();

                List<ISearchResults> results = allResults.ToList();

Once I have the List of ISearchResult items, I need to convert the list to a new object with the values froms the document. I've had a google round and noticed I should be able to use the following 'Fields' property within ISearchResult to get the values out:

List<MyObject> items = results.Select(r => new MyObject()
                {
                    Title = r.Fields["title"]
                });

But, Fields is empty in every ISearchResult item. So, I'm having to use the GetByID() method to grab each document first, which is making the page very slow to load.

Is there something I've missed to get these ISearchResult items with the Fields property populated?