NUTCH-1823 Upgrade to elasticsearch 1.4.1

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1644798 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1897 Easier debugging of plugin XML errors


git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1644857 13f79535-47bb-0310-9956-ffa450edef68