Add authentication_mode to aws_elasticache_user

.changelog/28928.txt

@@ -0,0 +1,7 @@
+```release-note:enhancement
+resource/aws_elasticache_user: Add `authentication_mode` argument
+```
+
+```release-note:bug
+resource/aws_elasticache_user: Change `user_id` to [ForceNew](https://developer.hashicorp.com/terraform/plugin/sdkv2/schemas/schema-behaviors#forcenew)
+```

internal/service/elasticache/find.go

@@ -183,30 +183,6 @@ func FindGlobalReplicationGroupMemberByID(ctx context.Context, conn *elasticache
 	}
 }
 
-func FindUserByID(ctx context.Context, conn *elasticache.ElastiCache, userID string) (*elasticache.User, error) {
-	input := &elasticache.DescribeUsersInput{
-		UserId: aws.String(userID),
-	}
-	out, err := conn.DescribeUsersWithContext(ctx, input)
-
-	if err != nil {
-		return nil, err
-	}
-
-	switch len(out.Users) {
-	case 0:
-		return nil, &resource.NotFoundError{
-			Message: "empty result",
-		}
-	case 1:
-		return out.Users[0], nil
-	default:
-		return nil, &resource.NotFoundError{
-			Message: "too many results",
-		}
-	}
-}
-
 func FindUserGroupByID(ctx context.Context, conn *elasticache.ElastiCache, groupID string) (*elasticache.UserGroup, error) {
 	input := &elasticache.DescribeUserGroupsInput{
 		UserGroupId: aws.String(groupID),

internal/service/elasticache/status.go

@@ -16,10 +16,6 @@ const (
 	ReplicationGroupStatusDeleting     = "deleting"
 	ReplicationGroupStatusCreateFailed = "create-failed"
 	ReplicationGroupStatusSnapshotting = "snapshotting"
-
-	UserStatusActive    = "active"
-	UserStatusDeleting  = "deleting"
-	UserStatusModifying = "modifying"
 )
 
 // StatusReplicationGroup fetches the Replication Group and its Status
@@ -130,20 +126,3 @@ func statusGlobalReplicationGroupMember(ctx context.Context, conn *elasticache.E
 		return member, aws.StringValue(member.Status), nil
 	}
 }
-
-// StatusUser fetches the ElastiCache user and its Status
-func StatusUser(ctx context.Context, conn *elasticache.ElastiCache, userId string) resource.StateRefreshFunc {
-	return func() (interface{}, string, error) {
-		user, err := FindUserByID(ctx, conn, userId)
-
-		if tfresource.NotFound(err) {
-			return nil, "", nil
-		}
-
-		if err != nil {
-			return nil, "", err
-		}
-
-		return user, aws.StringValue(user.Status), nil
-	}
-}