### 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/ShardRouting.java
public ShardRouting(ShardId shardId, StreamInput in) throws IOException {
        this.shardId = shardId;
        currentNodeId = in.readOptionalString();
        relocatingNodeId = in.readOptionalString();
        primary = in.readBoolean();
        state = ShardRoutingState.fromValue(in.readByte());
        if (state == ShardRoutingState.UNASSIGNED || state == ShardRoutingState.INITIALIZING) {
            recoverySource = RecoverySource.readFrom(in);
        } else {
            recoverySource = null;
        }
        unassignedInfo = in.readOptionalWriteable(UnassignedInfo::new);
        if (in.getVersion().onOrAfter(RELOCATION_FAILURE_INFO_VERSION)) {
            relocationFailureInfo = RelocationFailureInfo.readFrom(in);
        } else {
            relocationFailureInfo = RelocationFailureInfo.NO_FAILURES;
        }
        allocationId = in.readOptionalWriteable(AllocationId::new);
        if (state == ShardRoutingState.RELOCATING
            || state == ShardRoutingState.INITIALIZING
            || (state == ShardRoutingState.STARTED && in.getVersion().onOrAfter(EXPECTED_SHARD_SIZE_FOR_STARTED_VERSION))) {
            expectedShardSize = in.readLong();
        } else {
            expectedShardSize = UNAVAILABLE_EXPECTED_SHARD_SIZE;
        }
        targetRelocatingShard = initializeTargetRelocatingShard();
    }
    public ShardRouting(StreamInput in) throws IOException {
        this(new ShardId(in), in);
    }