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hey guys, i'm not sure whether this is a pulumi issue or an AWS issue..

we have an elasticache cluster in our stack that was created with compatibility version: `6.x` eg:

``` const redis = new Cluster(ResourceName("redis"), {        
        engine: "redis",
        engineVersion: "6.x",
        nodeType: "cache.t3.micro",
        numCacheNodes: 1,
        parameterGroupName: "default.redis6.x",
        port: 6379,
        subnetGroupName: redisSubnetGroup.name,
        securityGroupIds: [redisSecurityGroup.id]
...```
i'm trying to upgrade it to version 7 but not having any luck..

i change to:

```...
        engineVersion: "7.x",
        parameterGroupName: "default.redis7",
...```
and i get the following error:
```Error updating ElastiCache cluster (kp-au-test2-redis-9221ace), error: InvalidParameterCombination: Cannot find version 7.x for redis```
i also tried specifying `engineVersion: "7.0"` , `engineVersion: "7"` and `engineVersion: "7.0.7"` and each time, i get the error:
```engine_version: Redis versions must match &lt;major&gt;.x when using version 6 or higher, or &lt;major&gt;.&lt;minor&gt;.&lt;bug-fix&gt;```
would anybody have any clues what we might be doing wrong?