### 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/ClusterInfo.java
* @see #shardIdentifierFromRouting
     */
    public ClusterInfo(
        Map<String, DiskUsage> leastAvailableSpaceUsage,
        Map<String, DiskUsage> mostAvailableSpaceUsage,
        Map<String, Long> shardSizes,
        Map<ShardId, Long> shardDataSetSizes,
        Map<ShardRouting, String> routingToDataPath,
        Map<NodeAndPath, ReservedSpace> reservedSpace
    ) {
        this.leastAvailableSpaceUsage = Map.copyOf(leastAvailableSpaceUsage);
        this.shardSizes = Map.copyOf(shardSizes);
        this.shardDataSetSizes = Map.copyOf(shardDataSetSizes);
        this.mostAvailableSpaceUsage = Map.copyOf(mostAvailableSpaceUsage);
        this.routingToDataPath = Map.copyOf(routingToDataPath);
        this.reservedSpace = Map.copyOf(reservedSpace);
    }
    public ClusterInfo(StreamInput in) throws IOException {
        this.leastAvailableSpaceUsage = in.readImmutableMap(StreamInput::readString, DiskUsage::new);
        this.mostAvailableSpaceUsage = in.readImmutableMap(StreamInput::readString, DiskUsage::new);
        this.shardSizes = in.readImmutableMap(StreamInput::readString, StreamInput::readLong);
        if (in.getVersion().onOrAfter(DATA_SET_SIZE_SIZE_VERSION)) {
            this.shardDataSetSizes = in.readImmutableMap(ShardId::new, StreamInput::readLong);
        } else {
            this.shardDataSetSizes = Map.of();
        }
        this.routingToDataPath = in.readImmutableMap(ShardRouting::new, StreamInput::readString);
        if (in.getVersion().onOrAfter(StoreStats.RESERVED_BYTES_VERSION)) {
            this.reservedSpace = in.readImmutableMap(NodeAndPath::new, ReservedSpace::new);
        } else {