Cherry-pick elastic#20736 to 7.9: Fill cloud.account.name with accoun…

…tID if account alias doesn't exist (elastic#20835)

* Fill cloud.account.name with accountID if account alias doesn't exist (elastic#20736)

* Fill cloud.account.name with accountID if account alias doesn't exist

(cherry picked from commit bae7b38)

CHANGELOG.next.asciidoc

@@ -108,6 +108,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Updates vm_compute metricset with more info on guest metrics. {pull}20448[20448]
 - Add fallback for PdhExpandWildCardPathW failing in perfmon metricset. {issue}20139[20139] {pull}20630[20630]
 - Fix resource tags in aws cloudwatch metricset {issue}20326[20326]  {pull}20385[20385]
+- Fill cloud.account.name with accountID if account alias doesn't exist. {pull}20736[20736]
 
 *Packetbeat*
 

x-pack/metricbeat/module/aws/aws.go

@@ -103,19 +103,24 @@ func NewMetricSet(base mb.BaseMetricSet) (*MetricSet, error) {
 	default:
 		awsConfig.Region = "us-east-1"
 	}
+
 	svcIam := iam.New(awscommon.EnrichAWSConfigWithEndpoint(
 		config.AWSConfig.Endpoint, "iam", "", awsConfig))
 	req := svcIam.ListAccountAliasesRequest(&iam.ListAccountAliasesInput{})
 	output, err := req.Send(context.TODO())
 	if err != nil {
 		base.Logger().Warn("failed to list account aliases, please check permission setting: ", err)
+		metricSet.AccountName = metricSet.AccountID
 	} else {
+		// When there is no account alias, account ID will be used as cloud.account.name
+		if len(output.AccountAliases) == 0 {
+			metricSet.AccountName = metricSet.AccountID
+		}
+
 		// There can be more than one aliases for each account, for now we are only
 		// collecting the first one.
-		if output.AccountAliases != nil {
-			metricSet.AccountName = output.AccountAliases[0]
-			base.Logger().Debug("AWS Credentials belong to account name: ", metricSet.AccountName)
-		}
+		metricSet.AccountName = output.AccountAliases[0]
+		base.Logger().Debug("AWS Credentials belong to account name: ", metricSet.AccountName)
 	}
 
 	// Get IAM account id