### 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 static final String LOOKUP_ACTION_NAME = EsqlQueryAction.NAME + "/lookup";
    private final ClusterService clusterService;
    private final SearchService searchService;
    private final TransportService transportService;
    private final Executor executor;
    private final BigArrays bigArrays;
    private final BlockFactory blockFactory;
    public EnrichLookupService(
        ClusterService clusterService,
        SearchService searchService,
        TransportService transportService,
        BigArrays bigArrays,
        BlockFactory blockFactory
    ) {
        this.clusterService = clusterService;
        this.searchService = searchService;
        this.transportService = transportService;
        this.executor = transportService.getThreadPool().executor(EsqlPlugin.ESQL_THREAD_POOL_NAME);
        this.bigArrays = bigArrays;