Snapshots of ES 1.7 on Google Cloud

Elastic Stack Elasticsearch
1

What options do I have. It seems there's no support for GCS

2

It has been added since 5.0:

3

Yes I understand. What if i'm stuck on 1.7 for a bit

4

I think that GCS has S3 compatible API so may be you can use it?
Otherwise you have to get the source code from 5.x and try to make it work with 1.7.