GCP Elastic Cloud regions may be experiencing routing issues due to GCP provider networking issues
Incident Report for ESS (Public)
Resolved
We've confirmed that the Google Cloud Global Load Balancing incident has been resolved.

Jul 17, 2018 13:19
The issue with Google Cloud Global Load balancers returning 502s has been resolved for all affected users as of 13:05 US/Pacific. We will conduct an internal investigation of this issue and make appropriate improvements to our systems to help prevent or minimize future recurrence. We will provide a more detailed analysis of this incident once we have completed our internal investigation.

https://status.cloud.google.com/incident/cloud-networking/18012
Posted Jul 17, 2018 - 20:30 UTC
Update
We're actively monitoring a known Google Cloud Platform Networking incident: https://status.cloud.google.com/incident/cloud-networking/18012
Posted Jul 17, 2018 - 20:01 UTC
Investigating
We are currently investigating this issue.
Posted Jul 17, 2018 - 19:57 UTC
This incident affected: GCP Iowa (us-central1) (Elasticsearch connectivity: GCP us-central1) and GCP Oregon (us-west1) (Elasticsearch connectivity: GCP us-west1).