benwtrent commented on PR #15676:
URL: https://github.com/apache/lucene/pull/15676#issuecomment-3929782048

   I don't understand your graphs. I would expect the following results:
   
    - Single shard to have the lowest vector ops and the lowest recall, but the 
best curve
    - Multi-shard independent to have much higher recall and number of shards 
times more vector ops than the single shard (there abouts)
    - Multi-shard collaborative to have lower vector ops and lower recall, 
moving closer to single shard.
   
   Your graphs show there is zero benefit for collaborative and that splitting 
data across shards significantly reduces recall!


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