Couldn't instantiate rest high level client when the cluster is secured with searchguard and ssl is enabled for the http layer

[kumar1993]

Hey, Guys i have a cluster which is running with elasticsearch 5.6.2, and it has searchguard plugin enabled, also SSL is enabled for both the transport layer as well as the http layer, when i execute the following curl command from the terminal
curl -k -u user:password https://localhost:9200, the response is returned and its fine, but when i instantiate a high level rest client using the following code

    public RccRestClient()
    throws NodeValidationException, IOException, CertificateException, NoSuchAlgorithmException,
    KeyStoreException, KeyManagementException, UnrecoverableKeyException {
    SSLContextBuilder sslBuilder = SSLContexts.custom()
        //.loadTrustMaterial(new File("/Users/kumard/Desktop/elasticsearch-5.6.2/config/truststore.jks"),"password".toCharArray());
                .loadKeyMaterial(new File("/Users/kumard/Desktop/elasticsearch-5.6.2/config/0-keystore.jks"),"password".toCharArray(),"password".toCharArray());
    final SSLContext sslContext = sslBuilder.build();

    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY,
        new UsernamePasswordCredentials("user", "password"));



    Header[] defaultHeaders = new Header[] {
        new BasicHeader("Authorization", "Basic " + encodeBase64("user:password".getBytes())) };
    RestClientBuilder restClientBuilder = RestClient
        .builder(new HttpHost("localhost",
            Integer.valueOf("9200"), "https"))
        .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
            @Override
            public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
                return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
            }
        });
//                .setHttpClientConfigCallback(
//                new RestClientBuilder.HttpClientConfigCallback() {
//                    @Override

// public HttpAsyncClientBuilder customizeHttpClient(
// HttpAsyncClientBuilder httpClientBuilder) {
// httpClientBuilder.setDefaultHeaders(Arrays.asList(defaultHeaders));
// httpClientBuilder.setSSLContext(sslContext);
// return httpClientBuilder;
// }
// }
//
// );

    restClientBuilder.setMaxRetryTimeoutMillis(10000);
    restClientBuilder.setDefaultHeaders(defaultHeaders);
    restClientBuilder.setFailureListener(new RestClient.FailureListener() {
        @Override
        public void onFailure(HttpHost host) {
            LOGGER.error("Couldn't initialize Low Level Rest Client");
            System.exit(-1);
        }
    }); 

i am getting IO exception saying with timeouts, there is no error being logged. what is the correct way to achieve this.