test 4.1 indexes too

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1454982 13f79535-47bb-0310-9956-ffa450edef68
hack around the current jdk8 backwards break bug to please jenkins

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1454985 13f79535-47bb-0310-9956-ffa450edef68