* changes:
Index groups that are created during init
Implement group index for ElasticSearch
Add REST endpoint to reindex a single group
Support default query for groups
Add query operator that matches groups that are visible to all users
Add group query operator to match groups by owner
Add group query operator to match groups by description
Support querying groups by name and name part
Set '_more_groups' on last group of query result
Add tests for group index
Groups API: Add query methods
Support arbitrary group queries via REST
Add new optional interface for REST collections to get request params
Add GroupQueryProcessor
IsVisibleToPredicate: Move describe method into base class
Index group on creation and whenever a group is evicted from cache
Initial implementation of group index in Lucene
Add initial GroupQueryBuilder and define key predicate for group index
Add schema and index definitions for groups index
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