anchor.diff:  [source,js]
   --------------------------------------------------
   {
  -  "index" : "idx",
  +  "index" : "my_index",
     "shard" : 0,
     "primary" : true,
     "current_state" : "started",
  
positive.code: [source,js]
  --------------------------------------------------
  {
    "index" : "idx",
    "shard" : 0,
    "primary" : true,
    "current_state" : "unassigned",
  
negative.code:         {
            "decider" : "same_shard",
            "decision" : "NO",
            "explanation" : "the shard cannot be allocated to the same node on which a copy of the shard already exists [[my_index][0], node[3sULLVJrRneSg0EfBB-2Ew], [P], s[STARTED], a[id=eV9P8BN1QPqRc3B4PLx6cg]]"
          }
        ]
      }
  