Support for changing AKS default node pool params without recreating the cluster

[adityasundaramurthy-maersk]

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Description

Provider v3.47.0 added support for expanding the default nodepool by changing VM size via #20628. However, this does not support changing other typically optional parameters, such as os_disk_size_gb, which may differ for a specific VM SKU and might need to be changed for other SKUs (for instance, when changing Standard_D8as_v4 to Standard_D4as_v4.

As we now have the ability to swap the default pool through a temporary pool, can this mechanism be used to modify these parameters that typically require recreating the cluster, or managing the change externally via Azure CLI and then importing the new state?

New or Affected Resource(s)/Data Source(s)

azurerm_kubernetes_cluster

Potential Terraform Configuration

Resource configuration remains unchanged

References

#7093
#20628
#21859 is related but applies to additional nodepools

[aristosvo]

Hi @adityasundaramurthy-maersk! Thanks for opening this issue.

As far as I know this should be covered by the open PR #21719.

[github-actions]

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