### Elasticsearch Version

8.4, 8.5, 8.6

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

Darwin

### Problem Description

The shards availability indicator should always be reporting diagnosis when its status is RED/YELLOW.
However, when an index is on a data node that runs out of disk space it will report RED but no diagnosis.

### Steps to Reproduce

Have multi-node cluster where a data (non-master) node that hosts an index runs out of disk space (the index cannot relocate somewhere else).
Call the Health API and the output will be something along these lines:
```
    "shards_availability": {
      "status": "red",
      "symptom": "This cluster has all shards available.",
      "details": {
        "initializing_primaries": 1,
        "started_replicas": 0,
        "initializing_replicas": 0,
        "unassigned_primaries": 0,
        "started_primaries": 1,
        "creating_primaries": 0,
        "unassigned_replicas": 0,
        "restarting_primaries": 0,
        "restarting_replicas": 0
      },
      "impacts": [
        {
          "id": "elasticsearch:health:shards_availability:impact:primary_unassigned",
          "severity": 1,
          "description": "Cannot add data to 1 index [test_index]. Searches might return incomplete results.",
          "impact_areas": [
            "ingest",
            "search"
          ]
        }
      ] 
    }
``` 

### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/cluster/routing/allocation/ShardsAvailabilityHealthIndicatorService.java
+ "].",
        ENABLE_INDEX_ALLOCATION_GUIDE
    );
    public static final String ENABLE_CLUSTER_ALLOCATION_ACTION_GUIDE = "https://ela.st/fix-cluster-allocation";
    public static final Diagnosis.Definition ACTION_ENABLE_CLUSTER_ROUTING_ALLOCATION = new Diagnosis.Definition(
        NAME,
        "enable_cluster_allocations",
        "Elasticsearch isn't allowed to allocate some shards from these indices because allocation for those shards has been disabled at "
            + "the cluster level.",
        "Check that the ["
            + EnableAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ENABLE_SETTING.getKey()
            + "] cluster setting is set to ["
            + EnableAllocationDecider.Allocation.ALL.toString().toLowerCase(Locale.getDefault())
            + "].",
        ENABLE_CLUSTER_ALLOCATION_ACTION_GUIDE
    );
    public static final String ENABLE_TIER_ACTION_GUIDE = "https://ela.st/enable-tier";
    public static final Map<String, Diagnosis.Definition> ACTION_ENABLE_TIERS_LOOKUP = DataTier.ALL_DATA_TIERS.stream()
        .collect(
            Collectors.toUnmodifiableMap(
                tier -> tier,
                tier -> new Diagnosis.Definition(
                    NAME,
                    "enable_data_tiers:tier:" + tier,
                    "Elasticsearch isn't allowed to allocate some shards from these indices because the indices expect to be allocated to "
                        + "data tier nodes, but there were not any nodes with the expected tiers found in the cluster.",
                    "Add nodes with the [" + tier + "] role to the cluster.",
                    ENABLE_TIER_ACTION_GUIDE
                )
            )