Once https://github.com/elastic/elasticsearch/issues/98503 is done, we can use our minimum version numbers in the SystemIndexMappingUpdate service instead of the old `Version` types. Mappings will be updated for a system index when all nodes have a matching descriptor mappings version for a system index, but this version is greater than what's stored in the mappings metadata.
server/src/test/java/org/elasticsearch/cluster/ClusterStateTests.java
"aliases" : [
                              "alias"
                            ],
                            "primary_terms" : {
                              "0" : 1
                            },
                            "in_sync_allocations" : {
                              "0" : [
                                "allocationId"
                              ]
                            },
                            "rollover_info" : {
                              "rolloveAlias" : {
                                "met_conditions" : { },
                                "time" : 1
                              }
                            },
                            "system" : false,
                            "timestamp_range" : {
                              "shards" : [ ]
                            },
                            "stats" : {
                              "write_load" : {
                                "loads" : [
                                  -1.0
                                ],
                                "uptimes" : [
                                  -1
                                ]
                              },