resolve TODOs

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1569442 13f79535-47bb-0310-9956-ffa450edef68
    OAK-1347

Remove 'members' property index

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1569444 13f79535-47bb-0310-9956-ffa450edef68