[Backport 2.x] [Search Pipelines] Add stats for search pipelines#8376

Merged

tlfeng merged 3 commits intoopensearch-project:2.xfrom mingshl:backport/backport-8053-to-2.x

Jul 5, 2023

+1,399-459

Commits on Jul 5, 2023

[Search Pipelines] Add stats for search pipelines (opensearch-project#8053 )

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