Pkg private unwrapIntoConcreteQuery

Signed-off-by: Finn Carroll <carrofin@amazon.com>

server/src/main/java/org/opensearch/search/aggregations/bucket/filterrewrite/Helper.java

@@ -60,7 +60,7 @@ private Helper() {}
      * Recursively unwraps query into the concrete form
      * for applying the optimization
      */
-    public static Query unwrapIntoConcreteQuery(Query query) {
+    static Query unwrapIntoConcreteQuery(Query query) {
         while (queryWrappers.containsKey(query.getClass())) {
             query = queryWrappers.get(query.getClass()).apply(query);
         }