[8.0](backport #30068) ZooKeeper module: Adapt to ZooKeeper 3.6+ mntr response fields' changes.

[mergify]

This is an automatic backport of pull request #30068 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.com

[botelastic]

This pull request doesn't have a Team:<team> label.

[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: 2022-02-22T13:39:48.814+0000

• Duration: 84 min 41 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6471
Skipped	1725
Total	8196

💚 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.

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

[mergify]

This pull request has not been merged yet. Could you please review and merge it @pfcoperez? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @pfcoperez? 🙏

[jsoriano]

@pfcoperez please review this changelog too.

[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/8.0/pr-30068 upstream/mergify/bp/8.0/pr-30068
git merge upstream/8.0
git push upstream mergify/bp/8.0/pr-30068