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(); // list collections { final List<String> collectionsList = CollectionAdminRequest.List.listCollections(cloudSolrClient); System.out.println("listCollections: " + collectionsList); } cloudSolrClient.close();

final String[] solrUrl = { "http://localhost:8983/solr" }; final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build(); final String collectionName = "collection2"; final int numShards = 2; final int numReplicas = 2; final int maxShardsPerNode = 2; final String solrZKConfigName = "_default"; // create collection { final CollectionAdminRequest.Create adminRequest = CollectionAdminRequest.Create .createCollection(collectionName, solrZKConfigName, numShards, numReplicas) .setMaxShardsPerNode(maxShardsPerNode); CollectionAdminResponse adminResponse = adminRequest.process(cloudSolrClient); System.out.println(adminResponse); } cloudSolrClient.close();

final String[] solrUrl = { "http://localhost:8983/solr" }; final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build(); final String collectionName = "collection2"; // delete collection { final CollectionAdminRequest.Delete adminRequest = CollectionAdminRequest.Delete.deleteCollection(collectionName); CollectionAdminResponse adminResponse = adminRequest.process(cloudSolrClient); System.out.println(adminResponse); } cloudSolrClient.close();

The "RELOAD" action is used when you have changed a configuration in ZooKeeper.
final String[] solrUrl = { "http://localhost:8983/solr" }; final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build(); final String collectionName = "collection1"; // reload collection { final CollectionAdminRequest.Reload adminRequest = CollectionAdminRequest.Reload.reloadCollection(collectionName); CollectionAdminResponse adminResponse = adminRequest.process(cloudSolrClient); System.out.println(adminResponse); } cloudSolrClient.close();

final String[] solrUrl = { "http://localhost:8983/solr" }; final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build(); final String aliasName = "alias1"; final String aliasedCollections = "collection1,collection2"; // create alias { final CollectionAdminRequest.CreateAlias adminRequest = CollectionAdminRequest.CreateAlias.createAlias(aliasName, aliasedCollections); CollectionAdminResponse adminResponse = adminRequest.process(cloudSolrClient); System.out.println(adminResponse); } cloudSolrClient.close();

final String[] solrUrl = { "http://localhost:8983/solr" }; final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build(); final String aliasName = "alias1"; // delete alias { final CollectionAdminRequest.DeleteAlias adminRequest = CollectionAdminRequest.DeleteAlias.deleteAlias(aliasName); CollectionAdminResponse adminResponse = adminRequest.process(cloudSolrClient); System.out.println(adminResponse); } cloudSolrClient.close();

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();