require admin role to use update-alternatives

[chaintng]

promote update-alternatives command to run as admin role

I have problem when i tried to run this ansible script to Google Compute Engine
It show below error

TASK [elasticsearch : correct java version selected] *****************************************************************************
fatal: [35.186.157.183]: FAILED! => {"changed": false, "failed": true, "msg": "Specified path  does not exist"}
        to retry, use: --limit @/.../Projects/ansible-elasticsearch/site.retry

After debug, it's because java_full_path has empty value because update-alternatives got error but hidden by failed_when: False

It look like, update-alternatives need to run by admin role

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[Crazybus]

LGTM

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[Crazybus]

jenkins test this please

[Crazybus]

The single test failure is from a flaky test.

@chaintng Thanks for the fix here!

[chaintng]

Woohooo, my PR got merged. Thank you!

[Crazybus]

@chaintng yay! I also created a PR to fix the flaky test: #450