Access in Kibana to a value of a flattened element

Hello:
I have in Elasticsearch 7.10 an index that includes an element of type Nested.
I have seen that it could not be displayed in Kibana, so I have reindexed to a new index flattening the Trace element.
The documents are of the type:
{
"_index": "my-index-flattened",
"_type": "_doc",
"_id": "b6b1baca-c34f-445e-8731-886325e2a5c4",
"_score": 1.0,
"_source": {
"nodeId": "dbdcb2b90eaf",
"timestamp": 1667907214403,
"application": "EVADUMAS",
"operation": "Call to the methods of the GeneraFirmaPades service",
"applicant": "APLI_AREA009",
"document": null,
"duration": 4988,
"sourcereference": null,
"textomensaje": "END - GeneraFirmaPades Request.",
"error": "D-301",
"servicio": "GeneraFirmaPades",
"department": "2731",
"procedure": "1785",
"trace": [
{
"application": "EVADUMAS",
"department": "2731",
"duration": 44,
"operation": "INI - Input Parameters Validation.",
"error": null,
"procedure": "1785",
"completed": true,
"timestamp": 1667907214597,
"transactionid": "5fd17630-15c1-40d6-b12f-d9da6cf2cde7"
},
{
"application": "EVADUMAS",
"department": "2731",
"duration": 4155,
"operacion": "INI - GeneraFirmaPades Request.",
"error": "D-301 FIN - GeneraFirmaPades Request.",
"procedure": "1785",
"completed": true,
"timestamp": 1667907214690,
"idtransaccion": "89ffa3f3-f029-4311-bca4-4502a06fe10a"
},
{
"application": "EVADUMAS",
"department": "2731",
"duration": 63,
"operation": "INI - Apply the stamp of the signature",
"error": null,
"procedure": "1785",
"completed": true,
"timestamp": 1667907214770,
"transactionid": "933e4a35-1125-45c0-9885-bf1c87467e11"
},
{
"application": "EVADUMAS",
"department": "2731",
"duration": 726,
"operation": "INI - Call Dumas.",
"error": null,
"procedure": "1785",
"completed": true,
"timestamp": 1667907214885,
"transactionid": "0385bd9c-e54a-456f-a5bc-a0c373c61d1d"
},
{
"application": "EVADUMAS",
"department": "2731",
"duration": 0,
"operacion": "INI - Call Sandra.",
"error": null,
"procedure": "1785",
"completed": false,
"timestamp": 1667907215659,
"transactionid": "32a1ea01-32ec-4bd9-b174-b9815ba741a0"
}
],
"idtransaccion": "b6b1baca-c34f-445e-8731-886325e2a5c4"
}
}
I would like to show in Kibana the values of the fields operation, duration ...

How could I do it?

Elasticsearch 7.10 is EOL and no longer supported. Please upgrade ASAP.

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