In order for the code bellow to work:

► Make sure to update the variables ("solrUrl", "collectionName", ...) with your information.

final String[] solrUrl = { "http://localhost:8983/solr" };

final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build();

// get cluster status
{
    final CollectionAdminRequest.ClusterStatus adminRequest = CollectionAdminRequest.ClusterStatus.getClusterStatus();

    CollectionAdminResponse adminResponse = adminRequest.process(cloudSolrClient);

    System.out.println(adminResponse);
}

cloudSolrClient.close();