[7.x](backport #28252) [Filebeat] - S3 Input - Add support for only iterating/accessing only…

[mergify]

This is an automatic backport of pull request #28252 done by Mergify.

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.io/

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2021-10-13T18:07:04.574+0000

• Duration: 101 min 8 sec

• Commit: ae65c58

Test stats 🧪

Test	Results
Failed	0
Passed	15299
Skipped	2333
Total	17632

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.

[aspacca]

/test

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/7.x/pr-28252 upstream/mergify/bp/7.x/pr-28252
git merge upstream/7.x
git push upstream mergify/bp/7.x/pr-28252

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)