| Name | Description | Type | Package | Framework |
| AbstractGroupFacetCollector | Base class for computing grouped facets. | Class | org.apache.lucene.search.grouping | Apache Lucene |
| AbstractGroupFacetCollector .FacetEntry | Represents a facet entry with a value and a count. | Class | org.apache.lucene.search.grouping.AbstractGroupFacetCollector | Apache Lucene |
| AbstractGroupFacetCollector .GroupedFacetResult | The grouped facet result. | Class | org.apache.lucene.search.grouping.AbstractGroupFacetCollector | Apache Lucene |
| AbstractGroupFacetCollector .SegmentResult | Contains the local grouped segment counts for a particular segment. | Class | org.apache.lucene.search.grouping.AbstractGroupFacetCollector | Apache Lucene |