Update app.py

app.py

@@ -115,7 +115,7 @@ async def chat(query,history,sources,reports,subtype,year):
         filter=rest.Filter(
                 must=[rest.FieldCondition(
                         key="metadata.source",
-                        match=rest.MatchAny(value=sources)
+                        match=rest.MatchValue(value=sources)
                     ),
                     rest.FieldCondition(
                         key="metadata.subtype",