anchor.diff:          "bar" : "baz",
           "foo" : "bar"
         },
  +      "store" : {
  +        "shard_copy" : "AVAILABLE"
  +      },
         "final_decision" : "NO",
  +      "final_explanation" : "the shard cannot be assigned because one or more allocation decider returns a 'NO' decision",
         "weight" : -1.3833332,
         "decisions" : [ {
           "decider" : "same_shard",
  
positive.code:         "bar" : "baz",
          "foo" : "bar"
        },
        "final_decision" : "CURRENTLY_ASSIGNED",        <2>
        "weight" : 0.0,
        "decisions" : [ {
          "decider" : "same_shard",
  
negative.code:     "PzdyMZGXQdGhqTJHF_hGgA" : {
        "node_name" : "node3",
        "node_attributes" : { },
        "store" : {
          "shard_copy" : "NONE"
        },
        "final_decision" : "NO",
        "final_explanation" : "the shard cannot be assigned because one or more allocation decider returns a 'NO' decision",
        "weight" : 2.3166666,
        "decisions" : [ {
          "decider" : "filter",
  