Construct RankEval Request w/ Template Java Elasticsearch RestHighLevelClient

Question

Using the 7.13.0 elasticsearch client I am able to run queries using the RankEvalRequest when I do not include the optional template parameter.

RankEvalSpec specification = new RankEvalSpec(
   new RatedRequest("id", docRanking, query),
   new MeanReciprocalRank(1, 10)
);
RankEvalRequest = new RankEvalRequest(specification, new String[]{myIndex});

The RankEvalSpec constructor accepts an optional templates parameter of the type Collection<ScriptWithId>. But that ScriptWithId class is private to the RankEvalSpec. How can I create a RankEvalRequest that includes a set of templates? Without the public ScriptWithId class I am not able to do this:

Collection<ScriptWithId> templates = new HashMap<String, ScriptWithId>();
templates.put("TemplateID", new ScriptWithId("Script"));

RankEvalSpec specification = new RankEvalSpec(
   new RatedRequest("id", docRanking, query),
   new MeanReciprocalRank(1, 10),
   templates
);
RankEvalRequest = new RankEvalRequest(specification, new String[]{myIndex});