将弹性IP连接到Terraform中的多个EC2实例

我正在尝试使用terraform将弹性IP连接到多个EC2实例。我已经能够创建EC2实例、专有网络和安全组,但在将弹性IP连接到EC2实例时出错。

资源AWS\u实例

resource "aws_instance" "create_instance" {

for_each = toset(var.instance_type)  
ami = var.ami   instance_type = each.value   
 vpc_security_group_ids = [aws_security_group.vpc-ssh.id, aws_security_group.vpc-web.id]  
availability_zone = var.availability_zone[index(var.instance_type,each.value)]
  tags = {
"key" = each.value   
 } 
}

我无法解码实例id应该如何在弹性IP资源定义中填充。

创建弹性IP

resource "aws_eip" "my-eip" {   
for_each = toset(var.instance_type)  
instance = aws_instance.create_instance[???].id    // what should be used here
vpc      = true   
depends_on = [aws_internet_gateway.vpc-dev-igw] }