Document LU JOIN/MV_EXPAND not respecting SORT

Author: alex-spies

docs/reference/query-languages/esql/_snippets/commands/layout/lookup-join.md

@@ -45,6 +45,12 @@ results, the output will contain one row for each matching combination.
 In case of name collisions, the newly created columns will override existing columns.
 ::::
 
+::::{warning}
+The output rows produced by `LOOKUP JOIN` can be in any order and may not
+respect preceding `SORT`s. To guarantee a certain ordering, place a `SORT` after
+any `LOOKUP JOIN`s.
+::::
+
 **Examples**
 
 **IP Threat correlation**: This query would allow you to see if any source

docs/reference/query-languages/esql/_snippets/commands/layout/mv_expand.md

@@ -22,6 +22,12 @@ MV_EXPAND column
 `column`
 :   The multivalued column to expand.
 
+::::{warning}
+The output rows produced by `MV_EXPAND` can be in any order and may not respect
+preceding `SORT`s. To guarantee a certain ordering, place a `SORT` after any
+`MV_EXPAND`s.
+::::
+
 **Example**
 
 :::{include} ../examples/mv_expand.csv-spec/simple.md