I'm using the following code to query examine in my Umbraco 8 website.

if (!ExamineManager.Instance.TryGetIndex(global::Umbraco.Core.Constants.UmbracoIndexes.ExternalIndexName, out var index))
            {
                throw new InvalidOperationException($"No index found with name");
            }

            var searcher = index.GetSearcher();
            var results = searcher.CreateQuery("content").NodeTypeAlias("investorReport").Execute();

The above code returns no results. However, when I enter the generated lucene in the backoffice I have multiple results.

+__IndexType:content +__NodeTypeAlias:investorreport

I've published, rebuild the indexes. What I am missing here. I'm using the most recent version of examine.