### 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 moveUnassignedFromPrimary() {
        assert state == ShardRoutingState.UNASSIGNED : "expected an unassigned shard " + this;
        if (primary == false) {
            throw new IllegalShardRoutingStateException(this, "Not primary, can't move to replica");
        }
        return new ShardRouting(
            shardId,
            currentNodeId,
            relocatingNodeId,
            false,
            state,
            PeerRecoverySource.INSTANCE,
            unassignedInfo,
            relocationFailureInfo,
            allocationId,
            expectedShardSize
        );
    }
    /**
     * returns true if this routing has the same allocation ID as another.
     * <p>
     * Note: if both shard routing has a null as their {@link #allocationId()}, this method returns false as the routing describe
     * no allocation at all..
     **/
    public boolean isSameAllocation(ShardRouting other) {
        boolean b = this.allocationId != null && other.allocationId != null && this.allocationId.getId().equals(other.allocationId.getId());
        assert b == false || this.currentNodeId.equals(other.currentNodeId)
            : "ShardRoutings have the same allocation id but not the same node. This [" + this + "], other [" + other + "]";
        return b;
    }