[Reporting] Exported CSV by saved search in dashboard panel action doesn't follow the date format pattern

[rqbazan]

Kibana version: 7.6.2

Elasticsearch version: 7.6.2

Server OS version: Docker

Browser version: Chrome 83.0.4103.61

Browser OS version: Windows 10 Pro (10.0.18363)

Original install method (e.g. download page, yum, from source, etc.):

I used the following docker-compose config https://github.com/deviantony/docker-elk/blob/master/docker-compose.yml

Describe the bug:

When I use this feature to download the CSV report directly from a dashboard panel, the file doesn't follow the date format pattern describes in advance settings of Kibana. ❌

But, when I use the discover sharing feature, I mean, this Generate CSV button ⬇ the generated CSV report follows the date format pattern. ✅

Steps to reproduce:

1. Clone the docker-elk repo, and use docker-compose to setup ELK
2. Add the sample flight data in order to download some reports
3. Go to [Flights] Global Flight Dashboard
4. Download the CSV report (like here) from the [Flights] Flight Log panel

Expected behavior:

Get the CSV report with well-formatted dates values

Screenshots (if relevant):

• File downloaded from the dashboard

• From download from the discover tab

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/kibana-reporting-services (Team:Reporting Services)

[tsullivan]

duplicate of #42231