anchor.diff:  
   [source,js]
   --------------------------------------------------
  +GET /_search
   {
       "sort" : [
           {
  
positive.code: 
  [source,js]
  --------------------------------------------------
  {
      "sort" : [
          {
  
negative.code: reversed as well. The sort is defined on a per field level, with special
  field name for `_score` to sort by score, and `_doc` to sort by index order.
  
  Assuming the following index mapping:
  
  [source,js]
  --------------------------------------------------
  PUT /my_index
  {
      "mappings": {
          "my_type": {
              "properties": {
                  "post_date": { "type": "date" },
                  "user": { 
                      "type": "string",
                      "fielddata": "true"
                  },
                  "name": {
                      "type": "string",
                      "fielddata": "true"
                  },
                  "age": { "type": "integer" }
              }
          }
      }
  }
  --------------------------------------------------
  // CONSOLE
  
  [source,js]
  --------------------------------------------------
  GET /my_index/my_type/_search
  {
      "sort" : [
          { "post_date" : {"order" : "asc"}},
  