Hello,
It is important to remember that it is your responsibility to keep your GCE VM guest software and libraries patched and updated with the latest security patches. For a list of ElasticSearch vulnerabilities and instructions for patching them, please see
this link.
You should have received an email with instructions for getting your project reinstated once you've taken appropriate actions to prevent such compromises.
If you have other questions or concerns, please feel free to reach out to me directly.
Regards,
-ScottVW
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Scott Van Woudenberg
Product Manager
Google Compute Engine