
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/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/LogicalPlanOptimizer.java
@Override
        protected LogicalPlan rule(Aggregate agg) {
            OrderBy order = findPullableOrderBy(agg.child());
            LogicalPlan p = agg;
            if (order != null) {
                p = agg.transformDown(OrderBy.class, o -> o == order ? order.child() : o);
            }
            return p;
        }
        private static OrderBy findPullableOrderBy(LogicalPlan plan) {
            OrderBy pullable = null;
            if (plan instanceof OrderBy o) {
                pullable = o;
            } else if (plan instanceof Eval
                || plan instanceof Filter
                || plan instanceof Project
                || plan instanceof RegexExtract
                || plan instanceof Enrich) {
                    pullable = findPullableOrderBy(((UnaryPlan) plan).child());
                }
            return pullable;
        }
    }
    static class PruneRedundantSortClauses extends OptimizerRules.OptimizerRule<OrderBy> {