anchor.diff:                                   |
                                   vote
   
  -Indexing a grand child document requires a `routing` value equals
  +Indexing a grandchild document requires a `routing` value equals
   to the grand-parent (the greater parent of the lineage):
   
   
  
positive.code: 
  PUT my_index/_doc/2?refresh
  {
    "text": "This is a another question",
    "my_join_field": {
      "name": "question"
    }
  
negative.code: // TEST[continued]
  
  <1> This child document must be on the same shard than its grand-parent and parent
  <2> The parent id of this document (must points to an `answer` document)
  