Merge changes Iac79af54,Ief41eccc,Iae52ade9,I0bd9eabb,I2ef5b9e1

* changes:
  Solr index requires SolrCloud rather than plain Solr
  Handle exceptions during reindexing
  InitIndex: Allow user to configure the Solr index URL
  Solr index URL should be configured under the main "index" section
  Improve information message about rebuilding the index