[Stable/apm-server] Support apm-server 7.0.0

[Mokto]

Signed-off-by: Théo Mathieu tmathieu.github@fastmail.com

What this PR does / why we need it:

This PR make apm-server support version 7.0.0. The healthcheck was working in 6.x.x but it is not working in 7.x.x anymore.

See https://www.elastic.co/guide/en/apm/server/current/high-availability.html for reference.

Which issue this PR fixes

Supports 7.0.0

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md

[k8s-ci-robot]

Hi @Mokto. Thanks for your PR.

I'm waiting for a helm member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mumoshu]

/ok-to-test

[Mokto]

Any update on this ? Thanks.

[mumoshu]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Mokto, mumoshu

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