cannot update the repository writePolicy from groovy

 
I'm trying to update a repository writePolicy from groovy to ALLOW_ONCE using the following code, but after restarting nexus, the writePolicy is reset back to the default value of ALLOW. It seems the in-memory changes are not persisted on disk. Or maybe this is not the right way to change the writePolicy.

import groovy.json.JsonOutput
import org.sonatype.nexus.repository.storage.WritePolicy
r = repository.repositoryManager.get("nuget-hosted")
r.stop()
r.configuration.attributes.storage.writePolicy = WritePolicy.ALLOW_ONCE
r.update(r.configuration)
r.start()

return JsonOutput.toJson([
configuration: r.configuration.attributes,
writePolicy: r.configuration.attributes.storage.writePolicy,
])

 
I've originally wrote about this at https://groups.google.com/a/glists.sonatype.com/forum/#!topic/nexus-users/6BszuArYf-I and it seems Danny is also affected by this at https://groups.google.com/a/glists.sonatype.com/d/msg/nexus-users/UJL3JjUwb3g/p79yWhAqAgAJ