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
(Issue 579) Review followup
(Issue-579) Fix rebase issue
(Issue 579) Fix merge conflict issue
Merge pull request #579 from mrvisser/issue-579

Add ability to search through messages