Major Description
RemoteSolrException lives in BaseHttpSolrClient. BaseHttpSolrClient should be deprecated; it's sort of replaced by HttpSolrClientBase. Even though this exception is only for Http, SolrClient is a decent parent class. Or make top level.
To make this transition from 9x to 10x better, we could simply add new classes without removing the old ones in 9x. The old can subclass the new. Eventually all of BaseHttpSolrClient will be removed.