diff --git a/src/test/java/org/opensearch/sdk/TestExtensionsRunner.java b/src/test/java/org/opensearch/sdk/TestExtensionsRunner.java
index 075d8894..f147ac6f 100644
--- a/src/test/java/org/opensearch/sdk/TestExtensionsRunner.java
+++ b/src/test/java/org/opensearch/sdk/TestExtensionsRunner.java
@@ -80,6 +80,7 @@ public class TestExtensionsRunner extends OpenSearchTestCase {
     public void setUp() throws Exception {
         super.setUp();
         this.extensionsRunner = new ExtensionsRunnerForTest();
+        extensionsRunner.setUniqueId("opensearch-sdk-1");
         this.extensionsInitRequestHandler = new ExtensionsInitRequestHandler(extensionsRunner);
 
         this.transportService = spy(