- AbstractAllGroupHeadsCollector
- AbstractAllGroupHeadsCollector.GroupHead
- AbstractAllGroupsCollector
- AbstractFirstPassGroupingCollector
- AbstractSecondPassGroupingCollector
- BlockGroupingCollector
- GroupDocs
- SearchGroup
- SentinelIntSet
- TermAllGroupHeadsCollector
- TermAllGroupsCollector
- TermFirstPassGroupingCollector
- TermSecondPassGroupingCollector
- TopGroups