7.0 Upgrade Assistant

Elastic Stack Elasticsearch
6

GET /_xpack/migration/assistance

results:

{
  "indices" : { }
}

and

POST /_xpack/migration/upgrade/.security

{
  "error" : {
    "root_cause" : [
      {
        "type" : "index_not_found_exception",
        "reason" : "no such index",
        "index_uuid" : "_na_",
        "index" : ".security"
      }
    ],
    "type" : "index_not_found_exception",
    "reason" : "no such index",
    "index_uuid" : "_na_",
    "index" : ".security"
  },
  "status" : 404
}

other then above output, elasticsearch master node does not produce any errors...

Reenable shard allocation. is enabled, yet upgrade fails(