OAK-1972: Async property index update may fail on DocumentMK with more than 100 index changes

Merged 1611041 and 1611277 from tunk

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1611285 13f79535-47bb-0310-9956-ffa450edef68
OAK-1966 - Add Hint for selecting more performant index in MongoDocumentStore#query

Merged 1611275 from trunk

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1611286 13f79535-47bb-0310-9956-ffa450edef68