### 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/qa/testFixtures/src/main/java/org/elasticsearch/xpack/esql/CsvTestUtils.java
) {
        Iterator<Iterator<Object>> values() {
            return EsqlQueryResponse.pagesToValues(dataTypes(), pages);
        }
    }
    static void logMetaData(List<String> actualColumnNames, List<Type> actualColumnTypes, Logger logger) {
        
        StringBuilder sb = new StringBuilder();
        StringBuilder column = new StringBuilder();
        for (int i = 0; i < actualColumnNames.size(); i++) {
            if (i > 0) {
                sb.append(" | ");
            }
            column.setLength(0);
            column.append(actualColumnNames.get(i));
            column.append("(");
            column.append(actualColumnTypes.get(i));
            column.append(")");
            sb.append(trimOrPad(column));
        }
        int l = sb.length();
        logger.info(sb.toString());
        sb.setLength(0);
        sb.append("-".repeat(Math.max(0, l)));
        logger.info(sb.toString());
    }
    static void logData(List<List<Object>> values, Logger logger) {
        for (List<Object> list : values) {
            logger.info(rowAsString(list));
        }