anchor.diff:      the task queue.
       
   `priority`::
  -    (string) The priority of the pending task.
  +    (string) The priority of the pending task. The valid priorities in descending priority order are: `IMMEDIATE` > `URGENT` > `HIGH` > `NORMAL` > `LOW` > `LANGUID`. 
       
   `source`::
       (string) A general description of the cluster task that may include a reason 
       and origin. 
  +    
  +`executing`::
  +    (boolean) True or false, indicating whether the pending tasks is currently getting executed or not.
       
   `time_in_queue_millis`::
       (integer) The time expressed in milliseconds since the task is waiting for 
  
positive.code:          "insert_order": 45,
           "priority": "HIGH",
           "source": "shard-started ([foo_2][0], node[tMTocMvQQgGCkj7QDHl3OA], [P], s[INITIALIZING]), reason [after recovery from shard_store]",
           "time_in_queue_millis": 858,
           "time_in_queue": "858ms"
        }
  
negative.code:          "insert_order": 101,
           "priority": "URGENT",
           "source": "create-index [foo_9], cause [api]",
           "executing" : true,
           "time_in_queue_millis": 86,
           "time_in_queue": "86ms"
        },
  