feat(opensearch): add OpenSearch 2.15 engine version

[spensireli]

Reason for this change

Amazon OpenSearch Service now supports OpenSearch version 2.15

Description of changes

Add support for opensearch engine 2.15

Description of how you validated changes

yarn test

Was not able to run cdk-integ

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

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[spensireli]

Clarification Request

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to a README file.

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If you would like to request an exemption from the status checks or clarification on feedback, please leave a comment on this PR containing Exemption Request and/or Clarification Request.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 4e193e9
• Result: FAILED
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[kaizencc]

duplicate of #31398, sorry they got to this first

[github-actions]

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