com.github.j5ik2o.reactive.aws
https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/appsync/AppSyncAsyncClient.html
https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/appsync/AppSyncClient.html
https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/appsync/AppSyncAsyncClient.html