ES 6.4.2 - error when trying to snapshot cluster to S3 bucket

i have open a new bucket on S3 and added full S3 permissions to the cluster instance Role.
but when attempting to snapshot like this:

"type": "s3",
"settings": {
"bucket": "my-bucket",
"region": "us-east-1"

i'm getting:
"error": {
"root_cause": [
"type": "remote_transport_exception",
"reason": "[ip-10-1-0-50][][indices:admin/create]"
"type": "string_index_out_of_bounds_exception",
"reason": "String index out of range: 0"
"status": 500
} has repository-s3 plugin installed and the elasticsearch service has been restarted.

could any one tell me what's causing the error and how to fix it?

This shouldn't be happening. Can you provide the stack trace that goes with this exception? It should be in the Elasticsearch log file.

thanks @DavidTurner, but i've already solved it.
i don't know why but it didn't work from the kibana dev tool.
it did work though with a curl and from cerebro.

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