### 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/InternalClusterInfoService.java
private void onStatsProcessed() {
            if (countDown.countDown()) {
                logger.trace("stats all received, computing cluster info and notifying listeners");
                callListeners();
            }
        }
        private void callListeners() {
            try {
                final ClusterInfo clusterInfo = getClusterInfo();
                boolean anyListeners = false;
                for (final Consumer<ClusterInfo> listener : listeners) {
                    anyListeners = true;
                    try {
                        logger.trace("notifying [{}] of new cluster info", listener);
                        listener.accept(clusterInfo);
                    } catch (Exception e) {
                        logger.info(() -> "failed to notify [" + listener + "] of new cluster info", e);
                    }
                }
                assert anyListeners : "expected to notify at least one listener";
                for (final ActionListener<ClusterInfo> listener : thisRefreshListeners) {
                    listener.onResponse(clusterInfo);
                }
            } finally {
                onRefreshComplete(this);
            }
        }
    }
    private void onRefreshComplete(AsyncRefresh completedRefresh) {
        final Runnable newRefresh;