OAK-154 Full text search index
 - switched to SerialMergeScheduler as a temp workaround for merge errors
 - enabled a new JCR test as the corresponding issue was fixed

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1430280 13f79535-47bb-0310-9956-ffa450edef68