Small BKD leaves encoded as CONTINUOUS_IDS so we must implement visit…

…(int docID) of IntersectVisitor

Signed-off-by: Finn Carroll <[email protected]>

server/src/main/java/org/opensearch/search/optimization/filterrewrite/TreeTraversal.java

@@ -104,10 +104,7 @@ private static PointValues.IntersectVisitor getIntersectVisitor(RangeCollectorFo
         return new PointValues.IntersectVisitor() {
             @Override
             public void visit(int docID) {
-                // this branch should be unreachable
-                throw new UnsupportedOperationException(
-                    "This IntersectVisitor does not perform any actions on a " + "docID=" + docID + " node being visited"
-                );
+                 collector.count(docID);
             }
 
             @Override