Forwarding our correlation ID as the
[`X-Opaque-Id`](https://www.elastic.co/guide/en/elasticsearch/reference/current/tasks.html#_identifying_running_tasks)
will allow us to track any long running tasks in the cluster back the
request in GitLab. This could help us track down problems like
https://gitlab.com/gitlab-com/gl-infra/production/-/issues/2318 where we
believe a single problematic project may be making the cluster unstable.