### Elasticsearch Version

main

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

all

### Problem Description

Do this

### Steps to Reproduce

```
rm /tmp/evil
for a in {0..9}; do
   for b in {0..9}; do
      echo '{"index": {}}' >> /tmp/evil
      echo '{"a": '$a', "b": '$b'}' >> /tmp/evil
   done
done
echo >> /tmp/evil

curl -uelastic:password -XDELETE localhost:9200/test
curl -HContent-Type:application/json -uelastic:password -XPUT localhost:9200/test
curl -HContent-Type:application/json -uelastic:password -XPOST localhost:9200/test/_bulk --data-binary @/tmp/evil
curl -HContent-Type:application/json -uelastic:password -XPOST localhost:9200/test/_forcemerge?max_num_segments=1
curl -HContent-Type:application/json -uelastic:password -XPOST localhost:9200/test/_refresh

curl -HContent-Type:application/json -uelastic:password -XPOST localhost:9200/_esql?pretty -d'{
   "query": "FROM test | STATS MAX(a) BY a, b | KEEP a"
}'
```

### Logs (if relevant)

_No response_
x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/enrich/EnrichLookupService.java
public String getDescription() {
                    return lookupDescription(sessionId, shardId, matchType, matchField, extractFields, inputPage.getPositionCount());
                }
            };
        }
    }
    private static String lookupDescription(
        String sessionId,
        ShardId shardId,
        String matchType,
        String matchField,
        List<NamedExpression> extractFields,
        int positionCount
    ) {
        return "ENRICH_LOOKUP("
            + " session="
            + sessionId
            + " ,shard="
            + shardId
            + " ,match_type="
            + matchType
            + " ,match_field="
            + matchField
            + " ,extract_fields="
            + extractFields
            + " ,positions="
            + positionCount
            + ")";
    }
    private static class LookupResponse extends TransportResponse {