RavenDB 4.x alternatives to EscapeQueryOptions.RawQuery?

In previous versions (3.5) there was the possibility to search using AND / OR operators across multiple fields transformed in a static index:

  var searchString = filter.ToLowerInvariant().Replace(" and ", " AND ").Replace(" or ", " OR ");
                var query = await session.Query<MyAbstractIndexCreationTask.Result, MyAbstractIndexCreationTask>()
                                .Search(element => element.FilterableItems, searchString, escapeQueryOptions: EscapeQueryOptions.RawQuery)
  

With 4.2 I need to rewrite code:

var searchString = filter.ToLowerInvariant().Replace(" and ", " AND ").Replace(" or ", " OR ");
                    var query = session.Query<MyAbstractIndexCreationTask.Result, MyAbstractIndexCreationTask>()
                        .Search(element => element.FilterableItems, searchString)

where EscapeQueryOptions.RawQuery cannot be passed in anymore. The closest thing I can find is session.advanced.rawquery with does not take AbstractIndexCreationTask for transformations.

Is there any possiblity to allow users to provide basic AND / OR filtering?