Fix elasticsearch index

[fg91]

What this PR does / why we need it:

The elasticsearch_index = f"inference-log-{seldon_namespace}-seldon-... of the metrics server is only correct if the namespace of the model happens to be seldon as the the elasticsearch index is called 'inference-log-seldon-<namespace>...'

Which issue(s) this PR fixes:
Fixes #2971

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

[seldondev]

Hi @fg91. Thanks for your PR.

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[ryandawsonuk]

@fg91 yes you're right, serving engine should come before namespace as it does in the request logger code
https://github.com/SeldonIO/seldon-core/blob/master/components/seldon-request-logger/app/log_helper.py#L44

And is mentioned in its README

/lgtm
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ryandawsonuk

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[ryandawsonuk]

/ok-to-test