fix: handle main loop errors correctly

[kruskall]

Do not call fatal or panic directly, instead propagate the error
to avoid multiple point of failure.

[ghost]

❕ Build Aborted

Either there was a build timeout or someone aborted the build.

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: 2022-07-29T11:37:33.564+0000

• Duration: 63 min 50 sec

Test stats 🧪

Test	Results
Failed	0
Passed	98
Skipped	32
Total	130

🤖 GitHub comments

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

• /test : Re-trigger the build.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[axw]

LGTM!