resources.md in cfn-guardian-0.6.12

- old
+ new

@@ -52,9 +52,10 @@
 | RDSClusterInstance          | Id               |
 | RedshiftCluster             | Id               |
 | Lambda                      | Id               |
 | CloudFrontDistribution      | Id               |
 | SQSQueue                    | Id               |
+| ElasticSearch               | Id, Domain       |
 
 
 ## Custom Resource Groups
 
 You may want to create a custom resource group if some of the resources require differewnt alarm configurations. To create a custom resource group create new name for the group and add the resources, then create the alarm template and inherit the desired alarms.
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