add backwards compatibility indexes for 4.9

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1606765 13f79535-47bb-0310-9956-ffa450edef68
fix OutOfCoffeeError, 4.9 indexes should be named 49...

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1606766 13f79535-47bb-0310-9956-ffa450edef68