Elasticache AutoMinorVersionUpgrade Bug

[mattheidelbaugh]

I am trying to mock creation of an elasticache cluster with AutoMinorVersionUpgrade set to True using the following API call on Moto version 5.0.28.

response = self.client.create_cache_cluster(
            CacheClusterId=cache_id,
            Engine=engine,
            AutoMinorVersionUpgrade=True,
            EngineVersion="7.1",
            NumCacheNodes=1,
            CacheNodeType="cache.r7g.large",
        )

For some strange reason, this returns AutoMinorVersionUpgrade: False in the response. I've tried stepping through with a debugger, but I'm a bit stumped. As far as I can tell, Moto itself returns the value as true from create_cache_cluster in responses.py. The switch seems to occur in botocore.endpoint.py in _do_get_response(). The response_dict on line 288 contains <AutoMinorVersionUpgrade>True</AutoMinorVersionUpgrade> still, but on line 314 in the parsed_response that is in json format the value has switched to 'AutoMinorVersionUpgrade': False. I would try to contribute a fix for this myself, but I haven't worked with a model which returns a XML rather than JSON, and I really couldn't say why this switch suddenly happens. This bug is easily reproducible by editing the test_create_redis_cache_cluster unit test to pass AutoMinorVersionUpgrade=True into create_cache_cluster and asserting it is also True in the response.