Hi
I use Lucene 9.7.0 but experienced the same behaviour with Lucene 9.6.0
when doing vector search as follows:
I have indexed about 200 vectors (dimension 768)
I build the query as follows
Query query = new KnnFloatVectorQuery("vector-field-name",
queryVector, k);
and do the search as follows:
TopDocs topDocs = searcher.search(query, k);
When I set k=27 then the top doc has a score of 0.7757
When I set the "k" value a little lower, e.g. k=24 then the top doc has
a score of 0.7319 and is not the same document as the one with the score
of 0.7757
And idea what I might be doing wrong or what I misunderstand?
Why does the value of k has an effect on the returned top doc?
Thanks
Michael
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