Tweak OpenPointInTimeRequest createTask

This commit addresses a super minor misalignment with master, applying exactly the same change that was made as part of #62057, which was backported before point in time APIs were backported.

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/search/action/OpenPointInTimeRequest.java

@@ -105,10 +105,13 @@ public String preference() {
         return preference;
     }
 
+    @Override
+    public String getDescription() {
+        return "open point in time: indices [" + String.join(",", indices) + "] keep_alive [" + keepAlive + "]";
+    }
+
     @Override
     public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
-        final Supplier<String> description =
-            () -> "open point in time: indices [" + String.join(",", indices) + "] keep_alive [" + keepAlive + "]";
-        return new SearchTask(id, type, action, description, parentTaskId, headers);
+        return new SearchTask(id, type, action, this::getDescription, parentTaskId, headers);
     }
 }