When using LBHttpSolrClient, it seems to should specify collection name(or core name) in baseSolrUrl, If there is no collection name(or core name), it cannot detect if a dead server comes alive automatically. Should we update the interface documentation to clarify this？
Refer: https://issues.apache.org/jira/browse/SOLR-14346 :（ I feel that often emails are not been sent (not found in lists.apache.org), which feels too strange
