anchor.diff:  [[search-rank-eval]]
  -=== Ranking Evaluation API
  +=== Ranking evaluation API
  +++++
  +<titleabbrev>Ranking evaluation</titleabbrev>
  +++++
   
   Allows you to evaluate the quality of ranked search results over a set of 
   typical search queries.
  
positive.code: [[search-rank-eval-api-request]]
  ==== {api-request-title}
  
  `GET /<index>/_rank_eval`
  
  `POST /<index>/_rank_eval`
  
  
  [[search-rank-eval-api-desc]]
  
negative.code: [[search-rank-eval-api-path-params]]
  ==== {api-path-parms-title}
  
  `<target>`::
  (Optional, string)
  Comma-separated list of data streams, indices, and index aliases used to limit
  the request. Wildcard (`*`) expressions are supported.
  +
  To target all data streams and indices in a cluster, omit this parameter or use
  `_all` or `*`.
  
  [[search-rank-eval-api-query-params]]
  ==== {api-query-parms-title}
  