mikemccand commented on issue #15540:
URL: https://github.com/apache/lucene/issues/15540#issuecomment-3820449683

   > I don't think we should prevent 0 vectors for similarities that support 
them. For example, dot-product and euclidean would work fine with 0 vectors 
right?
   
   Yeah +1.  It's kinda the vector equivalent of the empty string term, which 
is indeed a valid term that you can index in Lucene if your tokenizer produces 
it.
   
   > Its only cosine that has the issue?
   
   I think so?  We should add dedicated unit test asserting the rights of these 
0-vectors, randomVectors test methods should occasionally throw in some of 
these bad boys, etc.


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