### Description

It should be enough to have ShardId + nodeId key in `routingToDataPath` to find the necessary data path. 
Changing the key would allow us to minimize the size of ClusterInfo size and find the data path when shard changes its status.

`ClusterInfo` might be sent over the wire when cluster allocation explain is executed with `includeDiskInfo=true`.
ShardRouting -> ShardId + nodeId conversion is trivial. The oposit would require additional information that could be faked.

Current key is also used in here:
https://github.com/elastic/elasticsearch/blob/9ebbe1c62bf0157d332f20f392544a1921a710df/server/src/main/java/org/elasticsearch/cluster/ClusterInfo.java#L149-L154
where it produces a string with ShardRouting#shortSummary that is excessive and might be simplified to ShardId + nodeId as well
server/src/main/java/org/elasticsearch/cluster/InternalClusterInfoService.java
private final Client client;
    private final List<Consumer<ClusterInfo>> listeners = new CopyOnWriteArrayList<>();
    private final Object mutex = new Object();
    private final List<ActionListener<ClusterInfo>> nextRefreshListeners = new ArrayList<>();
    private final ClusterService clusterService;
    private AsyncRefresh currentRefresh;
    private RefreshScheduler refreshScheduler;
    public InternalClusterInfoService(Settings settings, ClusterService clusterService, ThreadPool threadPool, Client client) {
        this.leastAvailableSpaceUsages = Map.of();
        this.mostAvailableSpaceUsages = Map.of();
        this.indicesStatsSummary = IndicesStatsSummary.EMPTY;
        this.threadPool = threadPool;
        this.client = client;
        this.clusterService = clusterService;
        this.updateFrequency = INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL_SETTING.get(settings);
        this.fetchTimeout = INTERNAL_CLUSTER_INFO_TIMEOUT_SETTING.get(settings);
        this.enabled = DiskThresholdSettings.CLUSTER_ROUTING_ALLOCATION_DISK_THRESHOLD_ENABLED_SETTING.get(settings);
        ClusterSettings clusterSettings = clusterService.getClusterSettings();
        clusterSettings.addSettingsUpdateConsumer(INTERNAL_CLUSTER_INFO_TIMEOUT_SETTING, this::setFetchTimeout);
        clusterSettings.addSettingsUpdateConsumer(INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL_SETTING, this::setUpdateFrequency);
        clusterSettings.addSettingsUpdateConsumer(
            DiskThresholdSettings.CLUSTER_ROUTING_ALLOCATION_DISK_THRESHOLD_ENABLED_SETTING,
            this::setEnabled
        );
    }
    private void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }
    private void setFetchTimeout(TimeValue fetchTimeout) {
        this.fetchTimeout = fetchTimeout;