anchor.diff:  }
   --------------------------------
   // CONSOLE
  +// TEST[setup:twitter]
   
   <1> Set to true to compute nDCG instead of DCG, default is false.
   
  
positive.code:     "metric": {
        "precision": {
          "relevant_rating_threshold": 1,              <1>
          "ignore_unlabeled": "false"                  <2>
        }
     }
  }
  --------------------------------
  // CONSOLE
  
  <1> For graded relevance ratings only ratings above this threshold are
  considered as relevant results for the given query. By default this is set to 1.
  
negative.code: 
  [source,js]
  --------------------------------
  GET /twitter/tweet/_rank_eval/template
  {
    "template": {
          "inline": {
              "query": {
                  "match": {
                      "{{field}}": {
                          "query": "{{query_string}}"}}}}},  <1>
    "requests": [
    {
  