[7.17] update beats to update the docker base image

[simitt]

Motivation/summary

Beats changed the docker base image from centos to ubuntu 20.04. Updating beats is required to also apply the change to APM Server.

This pulls in breaking changes from libbeat related to idxmgmt; elastic/beats@84bf434#diff-701b51cb205dec9db43f1a3cd736b11c6123705c17be1786570c264bcb6c93f8 adds IsAlias() to the IndexSelector Interface. It enables the output handler to require an alias instead of an index when ingesting data. This PR introduces the missing function, but for now always returns false for the IsAlias() check. Even when ILM is enabled, APM Server still needs to write to indices for sourcemaps and onboarding. Therefore the newly introduced check cannot simply be leveraged by APM at this point.

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

How to test these changes

• Build docker image DEV=true SNAPSHOT=true PLATFORMS=linux/amd64 TYPES=docker mage package
• Start apm-server docker image and exec into it
• Ensure the base image is Ubuntu 20.04

apm-server@bcf8c1e2426b:~$ cat /etc/redhat-release /etc/lsb-release /etc/debian_version
cat: /etc/redhat-release: No such file or directory
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.3 LTS"
bullseye/sid

Related issues

related to elastic/beats#29255

[apmmachine]

🤖 GitHub comments

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[simitt]

/test

[simitt]

@graphaelli please see the updated description regarding reverting back the alias related check for idxmgmt handling.

[simitt]

/test

[simitt]

/test