[stable/elasticsearch-exporter] Add ServiceMonitor metricRelabeling

[calvinbui]

Signed-off-by: Calvin Bui [email protected]

What this PR does / why we need it:

Adds the ServiceMonitor metricRelabelings key as documented in the Prometheus Operator API.

Used for adding, dropping or renaming labels at ingestion time, or to drop entire metrics that are not useful.

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
• Title of the PR starts with chart name (e.g. [stable/mychartname])

[k8s-ci-robot]

Hi @calvinbui. Thanks for your PR.

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[calvinbui]

/assign caarlos0

[calvinbui]

/assign @svenmueller

[svenmueller]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: calvinbui, svenmueller

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