add workload management IT

Signed-off-by: Ruirui Zhang <mariazrr@amazon.com>

CHANGELOG.md

@@ -14,7 +14,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fallback to Remote cluster-state on Term-Version check mismatch - ([#15424](https://github.com/opensearch-project/OpenSearch/pull/15424))
 - Implement WithFieldName interface in ValuesSourceAggregationBuilder & FieldSortBuilder ([#15916](https://github.com/opensearch-project/OpenSearch/pull/15916))
 - Add successfulSearchShardIndices in searchRequestContext ([#15967](https://github.com/opensearch-project/OpenSearch/pull/15967), [#16110](https://github.com/opensearch-project/OpenSearch/pull/16110))
-- [Tiered Caching] Segmented cache changes ([#16047](https://github.com/opensearch-project/OpenSearch/pull/16047))
+- [Tiered Caching] Segmented cache changes ([#16047](https://github.com/opensearch-project/OpenSearch/pull/16047))s
+- [Workload Management] Add Workload Management IT ([#16359](https://github.com/opensearch-project/OpenSearch/pull/16359))
 - Add support for msearch API to pass search pipeline name - ([#15923](https://github.com/opensearch-project/OpenSearch/pull/15923))
 - Add _list/indices API as paginated alternate to _cat/indices ([#14718](https://github.com/opensearch-project/OpenSearch/pull/14718))
 - Add success and failure metrics for async shard fetch ([#15976](https://github.com/opensearch-project/OpenSearch/pull/15976))

server/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

@@ -314,7 +314,7 @@ public void testSearchCancellationWithBackpressureDisabled() throws InterruptedE
         assertNull("SearchShardTask shouldn't have cancelled for monitor_only mode", caughtException);
     }
 
-    private static class ExceptionCatchingListener implements ActionListener<TestResponse> {
+    public static class ExceptionCatchingListener implements ActionListener<TestResponse> {
         private final CountDownLatch latch;
         private Exception exception = null;
 
@@ -333,7 +333,11 @@ public void onFailure(Exception e) {
             latch.countDown();
         }
 
-        private Exception getException() {
+        public CountDownLatch getLatch() {
+            return latch;
+        }
+
+        public Exception getException() {
             return exception;
         }
     }
@@ -349,7 +353,7 @@ private Supplier<String> descriptionSupplier(String description) {
         return () -> description;
     }
 
-    interface TaskFactory<T extends Task> {
+    public interface TaskFactory<T extends Task> {
         T createTask(long id, String type, String action, String description, TaskId parentTaskId, Map<String, String> headers);
     }