error configuring snapshot repository in S3 US Standard region

[clintongormley]

According to AWS S3 documentation http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGETlocation.html the empty string is used for create buckets in the US classic region. But configuring an empty region in the snapshot raises this error in elasticsearch:

org.elasticsearch.ElasticsearchIllegalArgumentException: No automatic endpoint could be derived from region []

us-east-1 can't be used because then AWS raise this error:
The specified location-constraint is not valid (Service: Amazon S3; Status Code: 400; Error Code: InvalidLocationConstraint

(Opened from elastic/elasticsearch#9202)

[dadoonet]

Indeed. In documentation we wrote that if no region is provided we fallback to default US region.
Wondering if we should really support region: "". Why providing the region in that case?

If we do that, we should also support it for ec2 regions.

@tlrx WDYT?

[pires]

Using "region": "us-standard" doesn't work as well.

{  
  "error":"RemoteTransportException[[Bushmaster][inet[/x.x.x.x:9300]][cluster:admin/repository/put]]; nested: RepositoryException[[elk_repository] failed to create repository]; nested: CreationException[Guice creation errors:\n\n1) Error injecting constructor, org.elasticsearch.ElasticsearchIllegalArgumentException: No automatic endpoint could be derived from region [us-standard]\n  at org.elasticsearch.repositories.s3.S3Repository.<init>()\n  at org.elasticsearch.repositories.s3.S3Repository\n  at Key[type=org.elasticsearch.repositories.Repository, annotation=[none]]\n\n1 error]; nested: ElasticsearchIllegalArgumentException[No automatic endpoint could be derived from region [us-standard]]; ",
  "status":500
}

FIXED

"region": "us-east-1"