app_engine_flexible_app_version service should be a required field or have a default value

[mcrmonkey]

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Terraform Version

v0.12.24

Affected Resource(s)

google_app_engine_flexible_app_version

Terraform Configuration Files

resource "google_app_engine_flexible_app_version" "test" {                      
  version_id = "v1"
  runtime    = "nodejs"
                                                                                
  deployment { 
    zip {
      source_url = "https://storage.googleapis.com/BUCKET/app.zip"
    }
  }
  automatic_scaling {
    cpu_utilization {
      target_utilization = "0.5"
    }
  }
                                                                                
  liveness_check {                                                              
    path = "/"                                                                  
  }                                                                             
  readiness_check {                                                             
    path = "/"                                                                  
  }                                                                             
}

Debug Output

https://gist.githubusercontent.com/mcrmonkey/2cf857a6b6dd764d63cfbd7b5527d78d/raw/4a606e92a7ddd269e67ef6bffa08a55b72b72956/TF-DEBUG.log

Panic Output

No panic output produced

Expected Behavior

The App Engine flex app should be deployed without issue

Actual Behavior

A server error is generated:

Error: Error creating FlexibleAppVersion: googleapi: Error 500: Internal error encountered.

Steps to Reproduce

Standard init plan apply process

Important Factoids

In the debug you can see the following: POST /v1/apps/GCP-PROJECT/services//versions?alt=json HTTP/1.1 ( note the // )
the service name is missing from here.

References

[ghost]

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