String zkHostString = "localhost:9983";
  String USER = "solr";
  String PASSWORD = "SolrRocks";


  CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
  credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(USER, PASSWORD));
  CloseableHttpClient httpClient =    HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider).build();

  CloudSolrClient solr = new CloudSolrClient.Builder().withZkHost(zkHostString).withHttpClient(httpClient).build();
  ((CloudSolrClient)solr).setDefaultCollection("gettingstarted");