### 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
public static final String INCREASE_CLUSTER_SHARD_LIMIT_ACTION_GUIDE = "https://ela.st/cluster-total-shards";
    public static final Diagnosis.Definition ACTION_INCREASE_SHARD_LIMIT_CLUSTER_SETTING = new Diagnosis.Definition(
        NAME,
        "increase_shard_limit_cluster_setting",
        "Elasticsearch isn't allowed to allocate some shards from these indices to any data nodes because each node has reached the "
            + "cluster shard limit.",
        "Increase the values for the ["
            + CLUSTER_TOTAL_SHARDS_PER_NODE_SETTING.getKey()
            + "] cluster setting or add more nodes to the target tiers.",
        INCREASE_CLUSTER_SHARD_LIMIT_ACTION_GUIDE
    );
    public static final Map<String, Diagnosis.Definition> ACTION_INCREASE_SHARD_LIMIT_CLUSTER_SETTING_LOOKUP = DataTier.ALL_DATA_TIERS
        .stream()
        .collect(
            Collectors.toUnmodifiableMap(
                tier -> tier,
                tier -> new Diagnosis.Definition(
                    NAME,
                    "increase_shard_limit_cluster_setting:tier:" + tier,
                    "Elasticsearch isn't allowed to allocate some shards from these indices because each node in the ["
                        + tier
                        + "] tier has reached the cluster shard limit. ",
                    "Increase the values for the ["
                        + CLUSTER_TOTAL_SHARDS_PER_NODE_SETTING.getKey()
                        + "] cluster setting or add more nodes to the target tiers.",
                    INCREASE_CLUSTER_SHARD_LIMIT_ACTION_GUIDE
                )
            )
        );
    public static final String MIGRATE_TO_TIERS_ACTION_GUIDE = "https://ela.st/migrate-to-tiers";