Added facet values aren't used to filter results

[ronaldbarendse]

While using Examine.Facets.MultiFacets, I noticed the values added to a facet aren't used to filter the results and the TotalItemCount reflects the cumulative facet hits, not the amount of returned results.

I've added/configured the FacetSearcher in a component using:

if (this.examineManager.TryGetIndex("ExternalIndex", out var index) &&
    index is LuceneIndex luceneIndex)
{
    var searcher = new MultiFacetSearcher("FacetSearcher", luceneIndex.GetIndexWriter(), luceneIndex.DefaultAnalyzer, luceneIndex.FieldValueTypeCollection);
    this.examineManager.AddSearcher(searcher);

    luceneIndex.FieldDefinitionCollection.AddOrUpdate(new FieldDefinition("creatorName", FieldDefinitionTypes.Raw));
}

if (this.examineManager.TryGetSearcher(Constants.ExternalFacetSearcher, out var searcher))
{
    var query = searcher.CreateQuery(IndexTypes.Content).Facet("creatorName").And().NodeTypeAlias("newsMessage");
    var results = query.Execute();
    var sameResultsCount = results.Count() == results.TotalItemCount; // False, although this should be True
    var sameHitsCount = results.GetFacet("creatorName").Sum(f => f.Hits) == results.TotalItemCount; // True, although this doesn't have to be the case
}

[callumbwhyte]

Hey @ronaldbarendse,

Thanks for using Examine Facets!

By default both BoboBrowse and MultiFacets return all facets for a given search - this is because MinHits is 0, so even facets without a match in the given result set are returned. If you wish to only return matching facets you must set MinHits to an appropriate level, like so:

query.Facet("field", "value").MinHits(1);

However, an issue in v1.0.0 means the MinHits() method hasn't been working... 🤪 This is fixed in v1.1.0!

Cheers,
Callum