Amazon Elasticsearch Service regularly performs infrastructure upgrades that improve the availability and resiliency of your domain. AWS is currently rolling out an infrastructure upgrade on your domain. The upgrade will be performed automatically after 14 days of receiving this notification which is 24 March 2020.
Because the IP addresses of elasticsearch might change after upgrade, we recommend you to take the following:
If you’re using a client, you should also ensure that the DNS cache in the client is cleared. If you are using a client library like aws-signing-request-interceptor (Request Interceptor for Apache Client that signs the request for AWS) please ensure you use the latest version of the library to avoid impact due to signature mismatch.
If you have questions or issues, Please let us know in #site-infra-channel.