ECE - Unable to use base_path in snapshot repository configuration

[benb (Ben)]

When attempting to configure an S3 snapshot repository in ECE I'm unable to specify a base_path like:

{
    "type": "s3",
    "settings": {
        "bucket": "backups",
        "base_path": "ece"
    }
}

When attempting this with an IAM role configured to only allow access to the ece directory it fails with the following error:

Unexpected error during step: [ensure-repository]: [
java.lang.Exception: Unable to ensure existence of snapshot repository: [
HttpResponse(500 Internal Server Error, HttpEntity(application/json; charset=UTF-8,
{
    "error":{
        "root_cause":[
            {
                "type":"repository_verification_exception",
                "reason":"[found-snapshots] path [snapshots/00000000000000000000000000000000] is not accessible on master node"
            }
        ],
        "type":"repository_verification_exception",
        "reason":"[found-snapshots] path [snapshots/00000000000000000000000000000000] is not accessible on master node",
        "caused_by":{
            "type":"i_o_exception",
            "reason":"Unable to upload object [snapshots/00000000000000000000000000000000/tests-0000000000000000000000/master.dat-temp] usi...),List(Warning: 299 Elasticsearch-5.6.5-6a37571 "[repositories.s3.buffer_size] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version." "Thu, 18 Jan 2018 00:00:00 GMT", Content-Type: application/json; charset=UTF-8, Content-Length: 800),HTTP/1.1)
]]

When giving the ECE instances full access to the bucket, everything works, but the snapshots end up in snapshots/, not ece/snapshots/.

This is the output of _snapshot of the cluster itself:

{"found-snapshots":{"type":"s3","settings":{"bucket":"backups","base_path":"snapshots/00000000000000000000000000000000"}}}

Is this just not supported in ECE yet?

[thiago (Thiago Souza)]

Yes, you can narrow down the permissions with an IAM Role. Please refer to this https://www.elastic.co/guide/en/elasticsearch/plugins/6.1/repository-s3-repository.html

[benb (Ben)]

I originally followed those exact steps and got the errors I listed above when attempting to place the snapshots in a directory.