Skip recording ES-metrics when there are none

Bob Van Landuytrequested to merge
bvl-skip-metrics-es-rack into master

What does this MR do?

This skips calling out into the Prometheus Client library entirely for requests that didn't call out to ElasticSearch.

Incrementing the counter by 0 would be a no-op anyway.

Closes #233858 (closed)

Edited by Bob Van Landuyt

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