### 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
clusterInfo,
                    null,
                    metadata,
                    routingTable
                );
            }
        }
        totalSize += sizeOfUnaccountableSearchableSnapshotShards;
        if (subtractShardsMovingAway) {
            for (ShardRouting routing : node.relocating()) {
                String actualPath = clusterInfo.getDataPath(routing);
                
                
                if (actualPath == null) {
                    
                    actualPath = clusterInfo.getDataPath(routing.asBeforeRelocation());
                }
                if (dataPath.equals(actualPath)) {
                    totalSize -= getExpectedShardSize(routing, 0L, clusterInfo, null, metadata, routingTable);
                }
            }
        }
        return totalSize;
    }
    private static final Decision YES_UNALLOCATED_PRIMARY_BETWEEN_WATERMARKS = Decision.single(
        Decision.Type.YES,
        NAME,
        "the node " + "is above the low watermark, but less than the high watermark, and this primary shard has never been allocated before"
    );
    private static final Decision YES_DISK_WATERMARKS_IGNORED = Decision.single(