Add release note for elastic#135051

Author: smalyshev

docs/changelog/135051.yaml

@@ -3,3 +3,13 @@ summary: Ban Limit + `MvExpand` before remote Enrich
 area: ES|QL
 type: bug
 issues: []
+highlight:
+  title: Mark Limit + MvExpand before remote Enrich as unsupported
+  body: |-
+    Due to the distribured nature of remote `ENRICH`, using a `LIMIT` command followed by a `MV_EXPAND` command before a remote `ENRICH` command
+    can lead to incorrect results. Such queries are identified by the engine and marked as unsupported, leading to query failure. Example:
+    [source,yaml]
+    ----------------------------
+    FROM *:events | SORT @timestamp | LIMIT 2 | MV_EXPAND ip | ENRICH _remote:clientip_policy ON ip
+    ----------------------------
+    Such query will now produce an error. The users are advised to rewrite it (e.g. by placing `ENRICH` earlier in the query) to avoid the error.