maxFacetHits

var response = await client.SetSettingsAsync(
  "ALGOLIA_INDEX_NAME",
  new IndexSettings { MaxFacetHits = 10 }
);

index.SearchForFacetValue(new SearchForFacetRequest
{
    FacetName = "category",
    FacetQuery = "phone",
    SearchParameters = new Query("query") { MaxFacetHits = 5 }
});