resource/aws_elasticache_cluster: Add Outpost support

[gdavison]

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Description

Add Outpost support to aws_elasticache_cluster.

Potential Terraform Configuration

New fields:

resource "aws_elasticache_cluster" "example" {
  ...
  outpost_mode = "single-outpost" # Valid values: "single-outpost" and "cross-outpost"

  preferred_outpost_arn = "<valid ARN>"
}

Note: only single-outpost is currently supported.

Note: CreateCacheClusterInput has both a single PreferredOutpostArn and list PreferredOutpostArns, but CacheCluster only has the field PreferredOutpostArn and does not have the field OutpostMode.

Affected Resource

• resource/aws_elasticache_cluster
• data source/aws_elasticache_cluster

Potential Terraform Configuration

# Copy-paste your Terraform configurations here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key.

References

• ElastiCache for Redis: https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/ElastiCache-Outposts.html
• ElastiCache for Memcached: https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/ElastiCache-Outposts.html

[weizhangfd]

👋 @gdavison I have made a PR for this enhancement, but I don't seem to have push right to the repo. Would you mind giving me the write access please? 🙏

Edit: I have just learned from https://github.com/hashicorp/packer/blob/main/.github/CONTRIBUTING.md that I should do a fork and open PR from there. Apologies for the unnecessary push right request.

Edit: I have attempted to implement this enhancement at #27934. Please could you kindly review at your earliest convenience? I apologies for not being able to run the acceptance tests on outpost myself. Thank you for your help in advance.

[github-actions]

This functionality has been released in v4.41.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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