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resource "aws_instance" "test" {
  ami           = "ami-0dfa284c9d7b2adad"
  instance_type = "t2.micro"
}

$ terraform import aws_instance.test i-xxxxxxxxxxxxxxxxx
aws_instance.test: Importing from ID "i-xxxxxxxxxxxxxxxxx"...
aws_instance.test: Import prepared!
  Prepared aws_instance for import
aws_instance.test: Refreshing state... [id=i-xxxxxxxxxxxxxxxxx]
Import successful!
The resources that were imported are shown above. These resources are now in
your Terraform state and will henceforth be managed by Terraform.

$ terraform plan
aws_instance.test: Refreshing state... [id=i-xxxxxxxxxxxxxxxxx]
Terraform used the selected providers to generate the following execution plan.
Resource actions are indicated with the following symbols:
  ~ update in-place
Terraform will perform the following actions:
  # aws_instance.test will be updated in-place
  ~ resource "aws_instance" "test" {
        id                                   = "i-xxxxxxxxxxxxxxxxx"
      ~ tags                                 = {
          - "Name" = "test" -> null
        }
      ~ tags_all                             = {
          - "Name" = "test"
        } -> (known after apply)
      + user_data_replace_on_change          = false
        # (29 unchanged attributes hidden)
        # (8 unchanged blocks hidden)
    }
Plan: 0 to add, 1 to change, 0 to destroy.
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Note: You didn't use the -out option to save this plan, so Terraform can't
guarantee to take exactly these actions if you run "terraform apply" now.

resource "aws_instance" "test" {
  ami           = "ami-0dfa284c9d7b2adad"
  instance_type = "t2.micro"
  tags = {
    Name = "test"
  }
}

$ terraform plan
aws_instance.test: Refreshing state... [id=i-xxxxxxxxxxxxxxxxx]
No changes. Your infrastructure matches the configuration.
Terraform has compared your real infrastructure against your configuration and
found no differences, so no changes are needed.

resource "aws_instance" "test" {
  ami           = "ami-0dfa284c9d7b2adad"
  instance_type = "t3a.micro"
  tags = {
    Name = "test"
  }
}

$ terraform apply
aws_instance.test: Refreshing state... [id=i-xxxxxxxxxxxxxxxxx]
Terraform used the selected providers to generate the following execution plan.
Resource actions are indicated with the following symbols:
  ~ update in-place
Terraform will perform the following actions:
  # aws_instance.test will be updated in-place
  ~ resource "aws_instance" "test" {
        id                                   = "i-xxxxxxxxxxxxxxxxx"
      ~ instance_type                        = "t2.micro" -> "t3a.micro"
        tags                                 = {
            "Name" = "test"
        }
      + user_data_replace_on_change          = false
        # (29 unchanged attributes hidden)
        # (8 unchanged blocks hidden)
    }
Plan: 0 to add, 1 to change, 0 to destroy.
Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.
  Enter a value: yes
aws_instance.test: Modifying... [id=i-xxxxxxxxxxxxxxxxx]
aws_instance.test: Still modifying... [id=i-xxxxxxxxxxxxxxxxx, 10s elapsed]
aws_instance.test: Still modifying... [id=i-xxxxxxxxxxxxxxxxx, 20s elapsed]
aws_instance.test: Still modifying... [id=i-xxxxxxxxxxxxxxxxx, 30s elapsed]
aws_instance.test: Still modifying... [id=i-xxxxxxxxxxxxxxxxx, 40s elapsed]
aws_instance.test: Modifications complete after 42s [id=i-xxxxxxxxxxxxxxxxx]
Apply complete! Resources: 0 added, 1 changed, 0 destroyed.