# All Classes and Interfaces

Class
Description
BitSetProducer
A producer of `BitSet`s per segment.
BlockJoinSelector
Select a value from a block of documents.
BlockJoinSelector.Type
Type of selection to perform.
CheckJoinIndex
Utility class to check a block join index.
DiversifyingChildrenByteKnnVectorQuery
kNN byte vector query that joins matching children vector documents with their parent doc id.
DiversifyingChildrenFloatKnnVectorQuery
kNN float vector query that joins matching children vector documents with their parent doc id.
DiversifyingNearestChildrenKnnCollectorManager
DiversifyingNearestChildrenKnnCollectorManager responsible for creating `DiversifyingNearestChildrenKnnCollector` instances.
JoinUtil
Utility for query time joining.
ParentChildrenBlockJoinQuery
A query that returns all the matching child documents for a specific parent document indexed together in the same block.
QueryBitSetProducer
A `BitSetProducer` that wraps a query and caches matching `BitSet`s per segment.
ScoreMode
How to aggregate multiple child hit scores into a single parent score.
SeekingTermSetTermsEnum
A filtered TermsEnum that uses a BytesRefHash as a filter
ToChildBlockJoinQuery
Just like `ToParentBlockJoinQuery`, except this query joins in reverse: you provide a Query matching parent documents and it joins down to child documents.
ToParentBlockJoinQuery
This query requires that you index children and parent docs as a single block, using the `IndexWriter.addDocuments()` or `IndexWriter.updateDocuments()` API.
ToParentBlockJoinSortField
A special sort field that allows sorting parent docs based on nested / child level fields.