Fix thread leak in ManyShardsIT (#128321)

Author: idegtiarenko

server/src/main/java/org/elasticsearch/common/util/iterable/Iterables.java

@@ -79,6 +79,6 @@ public static <T> int indexOf(Iterable<T> iterable, Predicate<T> predicate) {
     }
 
     public static long size(Iterable<?> iterable) {
-        return StreamSupport.stream(iterable.spliterator(), true).count();
+        return StreamSupport.stream(iterable.spliterator(), false).count();
     }
 }