Why isn't cosine similarity implemented?

danielspeixoto · March 15, 2019, 1:03am

I'm conducting a research using elasticsearch. I was planning to use cosine similarity but I noted that it is unavailable and instead we have BM25 as default scoring function.
Is there a reason for that? Is cosine similarity improper for querying documents? Why was BM25 chosen as default?
Thanks

system · April 12, 2019, 1:03am

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Why isn't cosine similarity implemented?

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