Expose cluster uuid in _cluster/stats endpoint

[ycombinator]

Metricbeat would like to collect cluster stats from the Elasticsearch cluster stats API (GET _cluster/stats). In a similar vein to #31791, please expose cluster_uuid as a field in the API response. This would help Metricbeat avoid making an additional API request to Elasticsearch to fetch the cluster UUID.

[elasticmachine]

Pinging @elastic/es-core-infra

[jasontedor]

@ycombinator Note for the future that we do not require an issue if you're going to open a PR for it. As long as the PR explains why the change is being made, we consider that enough and prefer to minimize the overhead of additional issues.

[ycombinator]

Good to know, thanks @jasontedor!