OAK-301 : oak docu

Remove recommendation for CopyOnRead for now

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1636584 13f79535-47bb-0310-9956-ffa450edef68
OAK-2241 - Support native queries for non-full-text indexes

Introduce NativeQueryIndex interface

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1636585 13f79535-47bb-0310-9956-ffa450edef68