Glossary

Term	Meaning
DWPT	Per-thread document writer used during concurrent indexing.
Segment	Immutable group of indexed documents and associated files.
Commit generation	Durable index point naming one complete set of segments.
NRT	Near-real-time view refreshed from an active writer.
Lease	Lifetime handle that keeps reader state or files usable.
CodecKit	LeanCorpus framing and compatibility support for binary formats.
DocValues	Column-oriented values used for sorting, aggregation and filtering.
HNSW	Approximate nearest-neighbour graph for vector search.
Search session	Retained point-in-time view used for stable cursor pagination.