### Description

Two indices:

**test1**
```
{
    "settings": {
        "routing_path": "event.dataset",
        "index": {
            "mode": "time_series"
        }
    },
    "mappings": {
        "properties": {
            "@timestamp": {
                "type": "date"
            },
            "bytes_counter": {
                "type": "long",
                "time_series_metric": "counter"
            },
            "event": {
                "properties": {
                    "dataset": {
                        "type": "keyword",
                        "time_series_dimension": true
                    }
                }
            }
        }
    }
}
```

with data

```
{ "index": { } }
{ "bytes":123,"@timestamp":123456789, "event.dataset":"x" }
```

**test2**
```
{
    "mappings": {
      "properties": {
        "bytes_counter": {
          "type": "long"
        }
      }
    }
}
```

with no data.

Running `from test* | limit 1` results in 

```
{
    "error": {
        "root_cause": [
            {
                "type": "illegal_argument_exception",
                "reason": "Field type [counter] is not supported"
            }
        ],
        "type": "illegal_argument_exception",
        "reason": "Field type [counter] is not supported"
    },
    "status": 400
}
```

Running `from test* | limit 0` results in

```
{
    "columns": [
        {
            "name": "@timestamp",
            "type": "date"
        },
        {
            "name": "bytes",
            "type": "long"
        },
        {
            "name": "bytes_counter",
            "type": "long"
        },
        {
            "name": "event.dataset",
            "type": "keyword"
        }
    ],
    "values": []
}
```

**Notice above `bytes_counter` as `long`**. Running `from test1 | limit 0` results in

```
{
    "columns": [
        {
            "name": "@timestamp",
            "type": "date"
        },
        {
            "name": "bytes",
            "type": "long"
        },
        {
            "name": "bytes_counter",
            "type": "unsupported"
        },
        {
            "name": "event.dataset",
            "type": "keyword"
        }
    ],
    "values": []
}
```
**Notice now the `bytes_counter` is unsupported**.
In a nutshell, `bytes_counter` is mapped as `long` in both indices, but the additional meta information about test1 variant is that this field is a time series `counter` field which is unsupported. When loading values, the source operator complains that the field is unsupported.
x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/enrich/EnrichPolicyResolver.java
public void messageReceived(ResolveRequest request, TransportChannel channel, Task task) throws Exception {
            String policyName = request.policyName;
            EnrichPolicy policy = policies().get(policyName);
            ThreadContext threadContext = threadPool.getThreadContext();
            ActionListener<ResolveResponse> listener = new ChannelActionListener<>(channel);
            listener = ContextPreservingActionListener.wrapPreservingContext(listener, threadContext);
            try (ThreadContext.StoredContext ignored = threadContext.stashWithOrigin(ClientHelper.ENRICH_ORIGIN)) {
                indexResolver.resolveAsMergedMapping(
                    EnrichPolicy.getBaseName(policyName),
                    IndexResolver.ALL_FIELDS,
                    false,
                    Map.of(),
                    listener.map(indexResult -> new ResolveResponse(new EnrichPolicyResolution(policyName, policy, indexResult)))
                );
            }
        }
    }
    public Set<String> allPolicyNames() {
        
        return policies().keySet();
    }
    private Map<String, EnrichPolicy> policies() {
        if (clusterService == null || clusterService.state() == null) {
            return Map.of();
        }
        EnrichMetadata metadata = clusterService.state().metadata().custom(EnrichMetadata.TYPE);
        return metadata == null ? Map.of() : metadata.getPolicies();
    }
}