diff --git a/src/integrationTest/java/org/opensearch/security/http/AsyncTests.java b/src/integrationTest/java/org/opensearch/security/http/AsyncTests.java
index db6c940b1f..ee46fb3905 100644
--- a/src/integrationTest/java/org/opensearch/security/http/AsyncTests.java
+++ b/src/integrationTest/java/org/opensearch/security/http/AsyncTests.java
@@ -11,12 +11,8 @@
 package org.opensearch.security.http;
 
 import com.carrotsearch.randomizedtesting.annotations.ThreadLeakScope;
-import com.nimbusds.jose.util.StandardCharset;
 
-import org.apache.hc.client5.http.classic.methods.HttpPost;
-import org.apache.hc.core5.http.ContentType;
 import org.apache.hc.core5.http.HttpStatus;
-import org.apache.hc.core5.http.io.entity.ByteArrayEntity;
 import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -29,7 +25,6 @@
 import org.opensearch.test.framework.cluster.TestRestClient;
 import org.opensearch.test.framework.cluster.TestRestClient.HttpResponse;
 
-import java.util.Collections;
 import java.util.Map;
 import java.util.List;
 import java.util.ArrayList;
@@ -59,7 +54,7 @@ public void testBulkAndCacheInvalidationMixed() throws Exception {
         String indexName = "test-index";
         final String invalidateCachePath = "_plugins/_security/api/cache";
         final String nodesPath = "_nodes";
-        final String bulkPath = "/_bulk";
+        final String bulkPath = "_bulk";
         final String document = ("{ \"index\": { \"_index\": \"" + indexName + "\" }}\n{ \"foo\": \"bar\" }\n").repeat(5);
         final int parallelism = 5;
         final int totalNumberOfRequests = 30;
@@ -78,9 +73,7 @@ public void testBulkAndCacheInvalidationMixed() throws Exception {
 
             allRequests.addAll(AsyncActions.generate(() -> {
                 countDownLatch.await();
-                final HttpPost post = new HttpPost(client.getHttpServerUri() + bulkPath);
-                post.setEntity(new ByteArrayEntity(document.getBytes(StandardCharset.UTF_8), ContentType.APPLICATION_JSON));
-                return client.executeRequest(post);
+                return client.postJson(bulkPath, document);
             }, parallelism, totalNumberOfRequests));
 
             allRequests.addAll(AsyncActions.generate(() -> {
@@ -90,7 +83,6 @@ public void testBulkAndCacheInvalidationMixed() throws Exception {
 
             // Make sure all requests start at the same time
             countDownLatch.countDown();
-            Collections.shuffle(allRequests);
 
             AsyncActions.getAll(allRequests, 30, TimeUnit.SECONDS).forEach((response) -> { response.assertStatusCode(HttpStatus.SC_OK); });
         }