| Name | Description | Type | Package | Framework |
| FacetsCollector | Collects hits for subsequent faceting. | Class | org.apache.lucene.facet | Apache Lucene |
| FacetsCollector .Docs | Used during collection to record matching docs and then return a DocIdSet that contains them. | Class | org.apache.lucene.facet.FacetsCollector | Apache Lucene |
| FacetsCollector .MatchingDocs | Holds the documents that were matched in the LeafReaderContext. | Class | org.apache.lucene.facet.FacetsCollector | Apache Lucene |