
Filing this issue to track a question/comment that was raised by @ywangd  here https://github.com/elastic/elasticsearch/pull/98309#discussion_r1294115440

One question I do have is why we chose to [execute the LookupRequest with the enrich origin](https://github.com/elastic/elasticsearch/blob/2e4440ff1c0decf79f8a40688566411f7d518aa7/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/enrich/EnrichLookupService.java#L141C2-L141C2). It means the following query works when the user has access to only the playlist index without access to either the songs enrich policy or its associated index.

```
FROM playlist | ENRICH songs ON song_id
```

It feels a bit weird to me that we have no control on who can use what enrich process. That said, we don't have a good story around enrich and ingest pipeline either, i.e. we have no control over who can use what pipeline where a pipeline can contain an enrich processor. There have been quite a few complaints from users and we have an https://github.com/elastic/elasticsearch/issues/57586 for it. I wonder whether we should not repeat the problem here with ES|QL. On the surface, it might be easier to tackle compared to ingest pipelines since ES|QL is read-only and has no "bulk" operations. What do you think?
x-pack/plugin/ql/src/main/java/org/elasticsearch/xpack/ql/expression/AttributeMap.java
@Override
        public Stream<U> parallelStream() {
            return set.parallelStream().map(this::unwrap);
        }
        @Override
        public int size() {
            return set.size();
        }
        @Override
        public boolean equals(Object o) {
            return set.equals(o);
        }
        @Override
        public int hashCode() {
            return set.hashCode();
        }
        @Override
        public Object[] toArray() {
            Object[] array = set.toArray();
            for (int i = 0; i < array.length; i++) {
                array[i] = ((AttributeWrapper) array[i]).attr;
            }
            return array;
        }
        @Override
        @SuppressWarnings("unchecked")
        public <A> A[] toArray(A[] a) {
            
            if (a.length < size()) {
                a = (A[]) java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), size());