Elastic specs have rolled over indices by default

What does this MR do and why?

Makes rolled over indices the default behavior in all :elastic* RSpec tags. In order to opt-out of this behavior, :elastic_clean can be used.

Closes #382632 (closed)

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.