[DOCS] Clarify that lookup runtime sub-fields can't be used in querie…

…s and aggs (elastic#91410)
abdonpijpelink · Nov 8, 2022 · d5a37eb · d5a37eb
1 parent 75b754e
commit d5a37eb
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/docs/reference/mapping/runtime.asciidoc b/docs/reference/mapping/runtime.asciidoc
@@ -816,6 +816,10 @@ experimental[]
 The <<search-fields,`fields`>> parameter on the `_search` API can also be used to retrieve fields from
 the related indices via runtime fields with a type of `lookup`.
 
+NOTE: Fields that are retrieved by runtime fields of type `lookup` can be used
+to enrich the hits in a search response. It's not possible to query or aggregate
+on these fields.
+
 [source,console]
 ----
 POST ip_location/_doc?refresh