kaivalnp opened a new pull request, #16687:
URL: https://github.com/apache/lucene/pull/16687

   ### Description
   
   Scalar quantization support for `FLOAT16` vectors was recently added in 
#16473.
   
   During merging of `FLOAT32` vectors, the quantized version is used to build 
HNSW graphs.
   
   Fixing the `FLOAT16` path to be consistent with `FLOAT32`, instead of using 
the input vectors during merge, which can be memory intensive.


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