### 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/test/java/org/elasticsearch/cluster/routing/allocation/decider/DiskThresholdDeciderUnitTests.java
allFullUsages,
            Map.of("[test][0][p]", 10L),
            Map.of(),
            Map.of(),
            Map.of()
        );
        RoutingAllocation allocation = new RoutingAllocation(
            new AllocationDeciders(Collections.singleton(decider)),
            clusterState,
            clusterInfo,
            null,
            System.nanoTime()
        );
        allocation.debugDecision(true);
        final RoutingNode routingNode = RoutingNodesHelper.routingNode("node_0", node_0);
        Decision decision = decider.canAllocate(test_0, routingNode, allocation);
        assertThat(decision.type(), equalTo(Decision.Type.YES));
        assertThat(decision.getExplanation(), containsString("disk watermarks are ignored on this index"));
        decision = decider.canRemain(
            metadata.getIndexSafe(test_0.index()),
            test_0.initialize(node_0.getId(), null, 0L).moveToStarted(ShardRouting.UNAVAILABLE_EXPECTED_SHARD_SIZE),
            routingNode,
            allocation
        );
        assertThat(decision.type(), equalTo(Decision.Type.YES));
        assertThat(decision.getExplanation(), containsString("disk watermarks are ignored on this index"));
    }
    public void testCannotForceAllocateOver100PercentUsage() {
        ClusterSettings nss = new ClusterSettings(Settings.EMPTY, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS);
        DiskThresholdDecider decider = new DiskThresholdDecider(Settings.EMPTY, nss);