Update CreateTopicDemo.java

Signed-off-by: SimiHunjan <simi.hunjan.k@gmail.com>

Author: SimiHunjan

.github/examples/java/CreateTopicDemo.java

@@ -54,7 +54,7 @@ public static void main(String[] args ) throws Exception {
         Thread.sleep(6000);
 
         // query messages using Mirror Node
-        String mirrorNodeUrl = "https://testnet.mirrornode.hedera.com/api/v1/topics/" + topicId + "/messages";
+        String mirrorNodeUrl = "https://localhost:5551/api/v1/topics/" + topicId + "/messages";
 
         HttpClient httpClient = HttpClient.newHttpClient( );
         HttpRequest request = HttpRequest.newBuilder()