Make resource child documents registered externally
(Issue 579) Allow pluggable child documents
(Issue-579) Ensure users, groups, members and memberships are reindexed with reindexAll
(Issue 579) Message search, improve document deletes and one-many parent-child
(Issue 579) Added tests for message search
(Issue 579) Cleaning up use of constants for search document mapping names
(Issue 579) Self-review
Use API method for submitting index tasks, filter by resource type for child producer
(Issue 579) Review followup
Boost query on  field
Add more strict message analyzer