Elastisearch tags is an Unknown Field?

Hi, in our elastic index we see data in the tags object like this:

tags	{
  "key": "Brand",
  "value": "Hugo Boss"
},
{
  "key": "ProductType",
  "value": "EdT"
},
{
  "key": "ScentType",
  "value": "Frisk"
},
{
  "key": "Size",
  "value": "125 ml"
}

The mapping looks finne ?

      "tags": {
    "type": "nested",
    "properties": {
      "key": {
        "type": "keyword"
      },
      "value": {
        "type": "keyword",
        "eager_global_ordinals": true
      }
    }
  },

But the field is listed as Unknown in Kibana
image

Any suggestions on how to fix this?

Litium version: 7.4

Kibana is not supporting nested fields in current versions. See https://discuss.elastic.co/t/kibana-visualizations-with-nested-field-types/195164

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