OAK-1796 - Update Mongo Java Driver version to 2.12

Updated mongo-java-driver to 2.12.2

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1602342 13f79535-47bb-0310-9956-ffa450edef68
OAK-1877: Hourly async reindexing on an idle instance

Hide the indexer status information under /:async so it won't end up re-triggering the indexer

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1602796 13f79535-47bb-0310-9956-ffa450edef68
OAK-1877: Hourly async reindexing on an idle instance

Remove debug print

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1602797 13f79535-47bb-0310-9956-ffa450edef68
OAK-1804: TarMK compaction

Drop the write number -based compaction threshold as it is troublesome
with large repositories where the size of the repository could exceed
the number of tar files used by compaction.

Move JVM gc to the point where it's most needed, i.e. just before cleanup.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1602800 13f79535-47bb-0310-9956-ffa450edef68
OAK-1892: OrderedIndexConcurrentClusterIT takes too long

Disable test for now.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1602809 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'upstream-trunk' into OAK-1717
OAK-1717 moved the @Ignore to the proper test after a wrong git merge.
OAK-1717 Concurrent updates of ordered index in cluster may fail

implemented the node deletion