fix(index, saved_searches): Refreshing Terraform state if resources are deleted outside of Terraform

[raytung]

Hey team,

This PR fixes a problem with the index and saved_searches resource if someone deleted them outside of Terraform. Instead of erroring out on Terraform plan / apply, it should recreate these resources.

[anushjay]

@raytung I don't think this scenario, which is caused by managing resources manually, should be handled within the provider. Can you not use the terraform rm state cmd to remove the resource from the tf config?

[raytung]

@anushjay In the ideal case, resources managed by Terraform shouldn't be managed manually, but in reality it's difficult to make that guarantee, especially in a tool like Splunk where it has a big exploratory component. In some cases, we need to allow Terraform to reconcile the state without having to manually running resource removal from Terraform states.

This problem is also mentioned in another issue #86

[jeffsanicola]

This would greatly help in my situation. We have a centralized Terraform deployment process where state files are supported by a different team. Every time I run into an issue like this I need to open a case with our support team to have the element removed from state. Enabling such drift detection would eliminate the need for me to open cases while developing modules that leverage this provider.

[raytung]

Hey @anushjay, would love to get your second thoughts on this.