Fix integration test failure by allowing direct access to system inde…

…x warning

Signed-off-by: gaobinlong <[email protected]>

notifications/notifications/src/test/kotlin/org/opensearch/integtest/PluginRestTestCase.kt

@@ -380,6 +380,25 @@ abstract class PluginRestTestCase : OpenSearchRestTestCase() {
             ?: NotificationConfigIndex.DEFAULT_SCHEMA_VERSION
     }
 
+    // only refresh the notification config index to avoid too many warnings
+    @Throws(IOException::class)
+    override fun refreshAllIndices() {
+        val refreshRequest = Request("POST", NotificationConfigIndex.INDEX_NAME + "/_refresh")
+        val requestOptions = RequestOptions.DEFAULT.toBuilder()
+        // Allow direct access to system index warning
+        requestOptions.setWarningsHandler { warnings: List<String> ->
+            if (warnings.isEmpty()) {
+                return@setWarningsHandler false
+            } else if (warnings.size > 1) {
+                return@setWarningsHandler true
+            } else {
+                return@setWarningsHandler !warnings[0].startsWith("this request accesses system indices:")
+            }
+        }
+        refreshRequest.setOptions(requestOptions)
+        client().performRequest(refreshRequest)
+    }
+
     protected class ClusterSetting(val type: String, val name: String, var value: Any?) {
         init {
             this.value = if (value == null) "null" else "\"" + value + "\""