SOLR-4816: CloudSolrServer can now route updates locally and no longer relies on inter-node update forwarding.
SOLR-3249: Allow CloudSolrServer and SolrCmdDistributor to use JavaBin.
SOLR-4816: CloudSolrServer now uses multiple threads to send updates by default.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1521713 13f79535-47bb-0310-9956-ffa450edef68
SOLR-3706: avoid NPE  (merge from 4x)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1521739 13f79535-47bb-0310-9956-ffa450edef68
SOLR-3706: getRenderedMessage() rather than + ""

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1521741 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5202: cleaned up comments surrounding clustering component. Left all the algorithms in there, but added a pointer to integration-strategies which includes more exhaustive configuration examples.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1521804 13f79535-47bb-0310-9956-ffa450edef68