DOCSP-29497 Aggregation Variable Limitations (#3010)

Author: ajhuh-mdb

source/release-notes/6.0-compatibility.txt

@@ -32,6 +32,15 @@ Aggregation
 
 .. include:: /includes/fact-allowDiskUseByDefault.rst 
 
+``$$SEARCH_META`` Limitations 
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Starting in MongoDB 6.0, the Atlas Search ``$$SEARCH_META`` aggregation variable 
+can be used anywhere after a :pipeline:`$search` stage in any pipeline, but it 
+cannot be used after the :pipeline:`$lookup` or :pipeline:`$unionWith` stage in 
+any pipeline. The ``$$SEARCH_META`` aggregation variable cannot be used in any 
+subsequent stage after a :pipeline:`$searchMeta` stage.
+
 
 Change Streams
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