SOCIAL-2546: removed search example of '+word1 +word2' because it doesn't behave not as explained in Lucene.
SOCIAL-3079 / SOCIAL-3269 / SOCIAL-3378: added search deleted items table, procedures and scheduler code. Fixed few unit tests.
SOCIAL-3079 / SOCIAL-3269 / SOCIAL-3378: added queue deleted item code for various entities.
SOCIAL-3079 / SOCIAL-3269 / SOCIAL-3378: added unit tests and modified flush to occur once at the end of the schedule job instead of after each batch.