benwtrent commented on code in PR #14963:
URL: https://github.com/apache/lucene/pull/14963#discussion_r2448314795
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lucene/core/src/java/org/apache/lucene/codecs/lucene104/Lucene104HnswScalarQuantizedVectorsFormat.java:
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@@ -60,6 +61,19 @@ public class Lucene104HnswScalarQuantizedVectorsFormat
extends KnnVectorsFormat
/** The format for storing, reading, merging vectors on disk */
private final Lucene104ScalarQuantizedVectorsFormat flatVectorsFormat;
+ /**
+ * The threshold to use to bypass HNSW graph building for tiny segments in
terms of k for a graph
+ * i.e. number of docs to match the query (default is {@link
+ * Lucene99HnswVectorsFormat#HNSW_GRAPH_THRESHOLD}).
+ *
+ * <ul>
+ * <li>0 indicates that the graph is always built.
+ * <li>0 indicates that the graph needs certain or more nodes before it
starts building.
Review Comment:
```suggestion
* <li>greater than 0 indicates that the graph needs a certain number of
nodes before it starts building. See {@link
Lucene99HnswVectorsFormat#HNSW_GRAPH_THRESHOLD} for details.
```
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