Input 'aws-s3' failed with: failed to initialize s3 poller

Elastic Stack Beats
39

@Andrea_Spacca I tested a quick change to x-pack/libbeat/common/aws/credentials.go and it seems to work well to send the initial API calls the the default region variable if the region isn't already set. I can submit a PR for it?

func InitializeAWSConfig(config ConfigAWS) (awssdk.Config, error) {
	AWSConfig, _ := GetAWSCredentials(config)

	// Set default region if empty to make initial aws api call
	if AWSConfig.Region == "" {
		if config.DefaultRegion != "" {
			AWSConfig.Region = config.DefaultRegion
		} else {
			AWSConfig.Region = "us-east-1"
		}
	}
....
}