incorporate review comments

src/aws-elasticache/README.md

@@ -12,12 +12,14 @@ This module has constructs for [Amazon ElastiCache](https://docs.aws.amazon.com/
 Setup required properties and create:
 
 ```ts
-const user = User(this, 'User', {
-  authenticationType: AuthenticationType.IAM,
+const newDefaultUser = User(this, 'DefaultUser', {
+  authenticationType: AuthenticationType.NO_PASSWORD,
+  userName: 'default',
 });
 
 const userGroup = new UserGroup(this, 'UserGroup', {
-  users: [user],
+  defaultUser: newDefaultUser,
+  users: [defaultUser, user],
 });
 ```
 
@@ -41,7 +43,7 @@ First, you need to create users by using `User` construct.
 
 With RBAC, you create users and assign them specific permissions by using `accessString` property.
 
-For more information, see [**Specifying Permissions Using an Access String](https://docs.aws.amazon.com/AmazonElastiCache/latest/dg/Clusters.RBAC.html#Access-string).
+For more information, see [Specifying Permissions Using an Access String](https://docs.aws.amazon.com/AmazonElastiCache/latest/dg/Clusters.RBAC.html#Access-string).
 
 Also you can choose authentication type by setting `authenticationType` property:
 
@@ -71,33 +73,48 @@ const user = User(this, 'User', {
 });
 ```
 
+ElastiCache automatically configures a default user with user ID and user name `default` and adds it to all user groups.
+You can't modify or delete this user.
+
+This user is intended for compatibility with the default behavior of previous Redis OSS versions and has an access string that permits it to call all commands and access all keys.
+
+To add proper access control to a cache, replace this default user with a new one that isn't enabled or uses a strong password.
+To change the default user, create a new user with the user name set to `default`. You can then swap it with the original default user.
+
+For more information, see [Applying RBAC to a Cache for ElastiCache with Valkey or Redis OSS](https://docs.aws.amazon.com/AmazonElastiCache/latest/dg/Clusters.RBAC.html#rbac-using).
+
+If you want to create new default user, `userName` must be `default` and `userId` must not be `default`:
+
+```ts
+const newDefaultUser = User(this, 'NewDefaultUser', {
+  authenticationType: AuthenticationType.NO_PASSWORD,
+  // default user name must be 'default'
+  userName: 'default',
+  // new default user id must not be 'default'
+  userId: 'new-default'
+});
+```
+
 ### Add users to the user group
 
 Next, create a user group by using `UserGroup` Construct and add users to the group:
 
 ```ts
+declare const newDefaultUser: User;
 declare const user: User;
 declare const anotherUser: User;
 
 const userGroup = new UserGroup(this, 'UserGroup', {
-  // add a user
-  users: [user],
+  // assign a default user
+  defaultUser: newDefaultUser,
+  // add users including default user
+  users: [defaultUser, user],
 });
 
 // you can also add a user by using addUser method
 userGroup.addUser(anotherUser);
 ```
 
-ElastiCache automatically configures a default user with user ID and user name `default` and adds it to all user groups.
-You can't modify or delete this user.
-
-This user is intended for compatibility with the default behavior of previous Redis OSS versions and has an access string that permits it to call all commands and access all keys.
-
-To add proper access control to a cache, replace this default user with a new one that isn't enabled or uses a strong password.
-To change the default user, create a new user with the user name set to `default`. You can then swap it with the original default user.
-
-For more information, see [**Creating Users and User Groups with the Console and CLI**](https://docs.aws.amazon.com/AmazonElastiCache/latest/dg/Clusters.RBAC.html#Users-management).
-
 ### Assign user group
 
 Finally, assign a user group to cache:
@@ -135,10 +152,10 @@ serverlessCache.grantConncet(role);
 
 ### Import an existing user and user group
 
-To import an existing user and user group, use the `User.fromUserId` and `UserGroup.fromUserGroupId` method:
+To import an existing user and user group, use the `User.fromUserAttributes` and `UserGroup.fromUserGroupId` method:
 
 ```ts
-const importedUser = User.fromUserId(this, 'ImportedUser', 'my-user-id');
+const importedUser = User.fromUserAttributes(this, 'ImportedUser', { userId: 'my-user-id', userName: 'my-user-name' });
 const importedUserGroup = UserGroup.fromUserGroupId(this, 'ImportedUser', 'my-user-group-id');
 ```