### 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/routing/allocation/decider/DiskThresholdDecider.java
}
            }
        },
        Setting.Property.NodeScope,
        Setting.Property.DeprecatedWarning
    );
    public static final Setting<Boolean> SETTING_IGNORE_DISK_WATERMARKS = Setting.boolSetting(
        "index.routing.allocation.disk.watermark.ignore",
        false,
        Setting.Property.IndexScope,
        Setting.Property.PrivateIndex
    );
    private final DiskThresholdSettings diskThresholdSettings;
    public DiskThresholdDecider(Settings settings, ClusterSettings clusterSettings) {
        this.diskThresholdSettings = new DiskThresholdSettings(settings, clusterSettings);
        assert Version.CURRENT.major < 9 : "remove enable_for_single_data_node in 9";
        
        boolean enabledForSingleDataNode = ENABLE_FOR_SINGLE_DATA_NODE.get(settings);
        assert enabledForSingleDataNode;
    }
    /**
     * Returns the size of all unaccounted shards that are currently being relocated to
     * the node, but may not be finished transferring yet. Also accounts for started searchable
     * snapshot shards that have been allocated, but not present in the stale cluster info.
     *
     * If subtractShardsMovingAway is true then the size of shards moving away is subtracted from the total size of all shards
     */
    public static long sizeOfUnaccountedShards(
        RoutingNode node,
        boolean subtractShardsMovingAway,