Umbraco 10 Examine search with wildcards

Question

I'd like to change the following code to include a leading and trailing wildcard. At present it it searching on the index 'bodyBlockListSearch' which I created to index all block list content. It works but I can see it omits content that would be included if it had wildcards. Any help appreciated.

_examineManager.TryGetIndex("ExternalIndex", out IIndex? index);
var results = index.Searcher.CreateQuery()
               .Field("bodyBlockListSearch", searchText)
               .Execute();