### 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
Decision.Type.YES,
        NAME,
        "disk watermarks are ignored on this index"
    );
    @Override
    public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
        Map<String, DiskUsage> usages = allocation.clusterInfo().getNodeMostAvailableDiskUsages();
        final Decision decision = earlyTerminate(usages);
        if (decision != null) {
            return decision;
        }
        if (allocation.metadata().index(shardRouting.index()).ignoreDiskWatermarks()) {
            return YES_DISK_WATERMARKS_IGNORED;
        }
        
        
        final DiskUsageWithRelocations usage = getDiskUsage(node, allocation, usages, false);
        
        double usedDiskPercentage = usage.getUsedDiskAsPercentage();
        long freeBytes = usage.getFreeBytes();
        final ByteSizeValue total = ByteSizeValue.ofBytes(usage.getTotalBytes());
        if (freeBytes < 0L) {
            final long sizeOfRelocatingShards = sizeOfUnaccountedShards(
                node,
                false,
                usage.getPath(),
                allocation.clusterInfo(),
                allocation.metadata(),
                allocation.routingTable(),
                allocation.unaccountedSearchableSnapshotSize(node)