
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/test/java/org/elasticsearch/xpack/ql/expression/AttributeMapTests.java
}
    private static AttributeMap<String> threeMap() {
        AttributeMap.Builder<String> builder = AttributeMap.builder();
        builder.put(a("one"), "one");
        builder.put(a("two"), "two");
        builder.put(a("three"), "three");
        return builder.build();
    }
    public void testAttributeMapWithSameAliasesCanResolveAttributes() {
        Alias param1 = createIntParameterAlias(1, 100);
        Alias param2 = createIntParameterAlias(2, 100);
        assertTrue(param1.equals(param2));
        assertTrue(param1.semanticEquals(param2));
        
        assertTrue(param1.child().equals(param2.child()));
        assertTrue(param1.child().semanticEquals(param2.child()));
        assertTrue(param1.toAttribute().equals(param2.toAttribute()));
        assertFalse(param1.toAttribute().semanticEquals(param2.toAttribute()));
        AttributeMap.Builder<Expression> mapBuilder = AttributeMap.builder();
        for (Alias a : List.of(param1, param2)) {
            mapBuilder.put(a.toAttribute(), a.child());
        }
        AttributeMap<Expression> newAttributeMap = mapBuilder.build();
        assertTrue(newAttributeMap.containsKey(param1.toAttribute()));
        assertTrue(newAttributeMap.get(param1.toAttribute()) == param1.child());
        assertTrue(newAttributeMap.containsKey(param2.toAttribute()));
        assertTrue(newAttributeMap.get(param2.toAttribute()) == param2.child());
    }
    public void testResolve() {
        AttributeMap.Builder<Object> builder = AttributeMap.builder();