Fix AccessControlException while creating client configuration for Pe…

…rsonalize client (#173) (#175)

### Description:
This change included fix AccessControlException while initialzing client configuration for AWS Personalize client.
We see below exception only when using credentials from opensearch keystore.
Exception message:
[ERROR][o.o.b.OpenSearchUncaughtExceptionHandler] [88665a0bfb08.ant.amazon.com] fatal error in thread [opensearch[88665a0bfb08.ant.amazon.com][management][T#2]], exiting
java.lang.ExceptionInInitializerError: null

Signed-off-by: Ketan Kulkarni <kektnr@amazon.com>
(cherry picked from commit e6fe9ed)

Co-authored-by: kulket <130191298+kulket@users.noreply.github.com>

src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/client/PersonalizeClient.java

@@ -33,8 +33,9 @@ public class PersonalizeClient implements Closeable {
      * @param awsRegion AWS region where Amazon Personalize campaign is hosted
      */
     public PersonalizeClient(AWSCredentialsProvider credentialsProvider, String awsRegion) {
-        ClientConfiguration clientConfiguration = new ClientConfiguration()
-                .withUserAgentPrefix(USER_AGENT_PREFIX);
+        ClientConfiguration clientConfiguration = AccessController.doPrivileged(
+                (PrivilegedAction<ClientConfiguration>) () -> new ClientConfiguration()
+                .withUserAgentPrefix(USER_AGENT_PREFIX));
         personalizeRuntime = AccessController.doPrivileged(
                 (PrivilegedAction<AmazonPersonalizeRuntime>) () -> AmazonPersonalizeRuntimeClientBuilder.standard()
                         .withCredentials(credentialsProvider)