Feature request: allow OpenSearch Auto-Tune to be disabled using CloudFormation XML

Question

70% of our development setup costs on AWS is due to OpenSearch not supporting turning off auto-tune for smaller instance types ("The T3 instance types do not support UltraWarm storage, cold storage, or Auto-Tune." - [Supported instance types in Amazon OpenSearch Service](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/supported-instance-types.html)).

Setup:
- We have a complete setup of our production environment for every engineer, including OpenSearch, to facilitate development. We use fewer/smaller instances for development but otherwise we have a complete prod setup for every engineer.
- We entirely rely on infrastructure as code, having our whole setup specified using CloudFormation XML. This includes setting up OpenSearch using `AWS::OpenSearchService::Domain`. Relying on CLI/Console is a bad idea, as it doesn't lead to repeatable deployments.
- Auto-tune cannot be controlled using CloudFormation: [Enabling or disabling Auto-Tune](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/auto-tune.html#auto-tune-enable)
- The T3 instance types, the only small instance type available, do not support Auto-Tune: [Supported instance types in Amazon OpenSearch Service](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/supported-instance-types.html)

This means every engineer has a mostly idle, m6g.large.search instance running. Wasting lots of money.

Answer

Hello,

Thank you for writing on re:Post.

From the case description, I understand that you would like to request a feature to get "Auto-Tune" property supported by CloudFormation and to support "Auto-Tune" property for T3 instance types also.

Thank you for sharing your feedback. Our product teams rely on valuable feedback like yours to prioritize new service features and functionality. I was able to find that there was already a feature request in place for a similar request like yours and your case has been added to the feature request to contribute towards prioritizing this feature by our internal team. Unfortunately, I do not have an ETA as to when the feature will be reviewed/implemented/released. We request our customers to keep an eye on product announcements for upcoming features. You may follow the AWS new announcements and feature releases in AWS news [1] and blogs [2].

Related information:

1.  What's New - https://aws.amazon.com/new/ 
2. AWS News Blog - https://aws.amazon.com/blogs/aws/
3. Release history - https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/ReleaseHistory.html

Feature request: allow OpenSearch Auto-Tune to be disabled using CloudFormation XML

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