org.apache.solr.common.SolrException: Cannot connect to cluster at 192.168.2.220:2181: cluster not found/not ready
	at org.apache.solr.common.cloud.ZkStateReader.createClusterStateWatchersAndUpdate(ZkStateReader.java:290)
	at org.apache.solr.client.solrj.impl.CloudSolrClient.connect(CloudSolrClient.java:467)
	at apache.App.testSolr(App.java:288)
	at apache.App.main(App.java:361)
 

解決

   String zkQuorum = "192.168.2.220:2181";改為：   String zkQuorum = "192.168.2.220:2181/infra-solr";