UI does not show the right create_timestamp of an index in indexes list page.

The real create_timestamp is 1676472115.

<img width="1510" alt="Capture d’écran 2023-02-15 à 15 44 02" src="https://user-images.githubusercontent.com/653704/219060008-fc8a3700-ba5d-4e52-93cf-aefa7415596d.png">
