diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14804bbd5974a..1f7d1ea5b3d19 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Make the class CommunityIdProcessor final ([#14448](https://github.com/opensearch-project/OpenSearch/pull/14448))
 - Allow @InternalApi annotation on classes not meant to be constructed outside of the OpenSearch core ([#14575](https://github.com/opensearch-project/OpenSearch/pull/14575))
 - Add @InternalApi annotation to japicmp exclusions ([#14597](https://github.com/opensearch-project/OpenSearch/pull/14597))
+- Allow system index warning in OpenSearchRestTestCase.refreshAllIndices ([#14635](https://github.com/opensearch-project/OpenSearch/pull/14635))
 
 ### Deprecated
 
diff --git a/test/framework/src/main/java/org/opensearch/test/rest/OpenSearchRestTestCase.java b/test/framework/src/main/java/org/opensearch/test/rest/OpenSearchRestTestCase.java
index b7c31685bafa6..8c612d258f183 100644
--- a/test/framework/src/main/java/org/opensearch/test/rest/OpenSearchRestTestCase.java
+++ b/test/framework/src/main/java/org/opensearch/test/rest/OpenSearchRestTestCase.java
@@ -708,11 +708,15 @@ protected void refreshAllIndices() throws IOException {
         requestOptions.setWarningsHandler(warnings -> {
             if (warnings.isEmpty()) {
                 return false;
-            } else if (warnings.size() > 1) {
-                return true;
-            } else {
-                return warnings.get(0).startsWith("this request accesses system indices:") == false;
             }
+            boolean allSystemIndexWarnings = true;
+            for (String warning : warnings) {
+                if (!warning.startsWith("this request accesses system indices:")) {
+                    allSystemIndexWarnings = false;
+                    break;
+                }
+            }
+            return !allSystemIndexWarnings;
         });
         refreshRequest.setOptions(requestOptions);
         client().performRequest(refreshRequest);