What is the MOST operationally efficient way to meet this requirement?
Use S3 Batch Operations. Specify the operation to replace all object tags.
Use the AWS CLI to get the tags for each object. Save the tags in a list. Use S3 Batch Operations. Specify the operation to delete all object tags. Use the AWS CLI and the list to retag the objects.
Use the AWS CLI to get the tags for each object. Save the tags in a list. Use the AWS CLI and the list to remove the object tags. Use the AWS CLI and the list to retag the objects.
Use the AWS CLI to copy the objects to another S3 bucket. Add the new tag to the copied objects. Delete the original objects.
Explanations:
S3 Batch Operations allow you to apply a tag modification to multiple objects at once, making this method the most operationally efficient and scalable way to replace tags across a large number of objects in an S3 bucket.
Using S3 Batch Operations to delete object tags first and then using the AWS CLI to retag the objects introduces unnecessary complexity and manual steps that could be avoided with a single operation.
Similar to option B, this method involves extra steps of retrieving, saving, and then manually applying the tags, which makes it more error-prone and less efficient compared to using S3 Batch Operations directly.
Copying objects to another bucket and then deleting the originals introduces additional overhead and complexity, including data transfer and the need for managing object copies, making it less efficient than directly modifying the tags.
I would say the answer is:
Use S3 Batch Operations. Specify the operation to replace all object tags.