Support added with new DebugResults object, which is added to a SearchResults instance. Debug results are enabled by one of two approaches:
1) Setting IsDebugEnabled to true on a QueryBuilder instance
2) Setting the ExplainOtherQuery property on a QueryBuilder instance, which is a full-fledged Query object
Various properties and collections are available on the DebugResults object that is populated when either of these two settings are applied.