Saved search sort order is ignored for embeddable config with 1-dimensional sort array

[rudolf]

Kibana version: 7.9.2

If a dashboard has a saved search panel, and the embeddableConfig for that panel has a 1-dimensional sort array, the sort order gets ignored. e.g.

{
    "embeddableConfig": {
        "columns": [
          "message",
        ],
        "sort": [
          "@timestamp",
          "desc"
        ]
    },
    ...
    "panelRefName": "panel_1"
    }
}

In v7.6.2 a 1-dimensional sort array was still applied to the saved search panel.

This seems related to #43038 because that migration never migrated embeddable configs.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[kertal]

I think this was fixed in 7.10 #76986 ... but will double check for this use case

[kertal]

Confirmed that this is a bug, and yes it's related to #43038 because that migration never migrated embeddable configs.