@Override
    protected AWSAppSyncAsync build(AwsAsyncClientParams params) {
        return new AWSAppSyncAsyncClient(params);
    }
Construct an asynchronous implementation of AWSAppSyncAsync using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AWSAppSyncAsync.
aws-java-sdk-appsync/src/main/java/com/amazonaws/services/appsync/AWSAppSyncAsyncClientBuilder.java