[DOCS] Add prod warning to composite agg (#78723) (#78780)

The composite aggregation is considered expensive. Users should perform load testing before deploying it in production. Co-authored-by: James Rodewig <[email protected]> Co-authored-by: Stef Nestor <[email protected]>
elastic · Oct 6, 2021 · 76ab5b3 · 76ab5b3
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 <titleabbrev>Composite</titleabbrev>
 ++++
 
+WARNING: The composite aggregation is expensive. Load test your application
+before deploying a composite aggregation in production.
+
 A multi-bucket aggregation that creates composite buckets from different sources.
 
 Unlike the other `multi-bucket` aggregations, you can use the `composite`