Access Elasticsearch by Google Click to Deploy from GAE

I'm trying access elasticsearch cluster on GKE from my project in GAE - flexible. Since I don't want an external load-balancer, I'm following this guide:
Both GKE and GAE are deployed in the same region, but the calls to the elasticsearch cluster timeout all the time. Has anyone done this and can share some tips would be much appreciated!

also this is in beta and could work for test or development

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