rnewson commented on PR #4710:
URL: https://github.com/apache/couchdb/pull/4710#issuecomment-1660300445

   the behaviour of `use_index` can't easily be changed (or, I think we'd all 
agree, _fixed_), short of a major version bump.
   
   If there was a roadmap here for couchdb 4.0 (handwaving, but imagine that 
use_index as an option goes away entirely. you either use `/dbname/_find` and 
let couchdb choose, or you use `/path/to/specific/index/_find` to choose for 
yourself).
   
   Without that, it's hard to decide whether adding more options is taking us 
somewhere better or just somewhere more confusing. As a user I would be 
legitimately baffled to be told I should use `use_index_strict` when I report 
that my `use_index` directive is being ignored.
   
   I'm not sure if I'm -0 or -1 on this, I'm veering to -0 though. I don't like 
leaving `use_index` as-is (it should never have been merely a hint) and I don't 
like adding another argument to do what `use_index` should have done.
   
   Hence I suggested having `_find` also reachable from a url that clearly is 
associated with a specific index resource, like we have for all the other kinds 
of index we have. That endpoint can return a 400 if the request parameters 
cannot be executed by the index.
   
   That idea also gives users a migration path away from the flawed choosing 
algorithm. A future (major) release of CouchDB might then drop `/dbname/_find` 
entirely.
   
   


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