OAK-2321 - Provide details in log when reindexing is completed by AsyncIndexUpdate

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1643186 13f79535-47bb-0310-9956-ffa450edef68
OAK-2321 - Provide details in log when reindexing is completed by AsyncIndexUpdate

Provide details around when the lease would expire

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1643204 13f79535-47bb-0310-9956-ffa450edef68