OAK-2221 Log path for text extraction error on the Lucene index

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1633315 13f79535-47bb-0310-9956-ffa450edef68
OAK-2208 - batch the requests for new documents in order to avoid OOM

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1633327 13f79535-47bb-0310-9956-ffa450edef68