Add check for usage of new API in multiple filters

Signed-off-by: Tomasz Pietrek <tomasz@nats.io>

server/errors.json

@@ -1328,5 +1328,15 @@
     "help": "",
     "url": "",
     "deprecates": ""
+  },
+  {
+    "constant": "JsConsumerCantUseNewAPIWithMultipleSubjectFilters",
+    "code": 400,
+    "error_code": 10135,
+    "description": "Consumer with multiple subject filters cannot use subject based API",
+    "comment": "",
+    "help": "",
+    "url": "",
+    "deprecates": ""
   }
 ]

server/jetstream_api.go

@@ -3813,6 +3813,13 @@ func (s *Server) jsConsumerCreateRequest(sub *subscription, c *client, a *Accoun
 		return
 	}
 
+	// in case of multiple filters provided, error if new API is used.
+	if filteredSubject != _EMPTY_ && len(req.Config.FilterSubjects) != 0 {
+		resp.Error = NewJsConsumerCantUseNewAPIWithMultipleSubjectFiltersError()
+		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
+		return
+	}
+
 	// Check for a filter subject.
 	if filteredSubject != _EMPTY_ && req.Config.FilterSubject != filteredSubject {
 		resp.Error = NewJSConsumerCreateFilterSubjectMismatchError()