anchor.diff:  --------------------------------------------------
   // TESTRESPONSE[s/"error" : "[^\"]+"/"error": "$body.explanations.0.error"/]
   
  -When the query is valid, the explanation defaults to the string
  -representation of that query. With `rewrite` set to `true`, the explanation
  -is more detailed showing the actual Lucene query that will be executed.
  -
  -For More Like This:
  +===== The rewrite parameter
  +
  +When the query is valid, the explanation defaults to the string representation 
  +of that query. With `rewrite` set to `true`, the explanation is more detailed 
  +showing the actual Lucene query that will be executed.
   
   [source,console]
   --------------------------------------------------
  
positive.code: [[search-validate]]
  === Validate API
  
  The validate API allows a user to validate a potentially expensive query
  without executing it. We'll use the following test data to explain _validate:
  
  [source,console]
  --------------------------------------------------
  
negative.code: --------------------------------------------------
  GET twitter/_validate/query?q=user:foo
  --------------------------------------------------
  // TEST[continued]
  
  
  The response contains `valid:true`:
  
  