SOLR-5509: better debug logging

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1546186 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5509: fix possible npe

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1546189 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5504: Windows can throw a ConnectException when Linux throws a SocketException - also add a bit more testing.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1546224 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5506: Support docValues in (ICU)CollationField

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1546245 13f79535-47bb-0310-9956-ffa450edef68