Add model parameter for DocSumGateway in gateway.py file

Signed-off-by: sgurunat <[email protected]>

comps/cores/mega/gateway.py

@@ -446,6 +446,7 @@ async def handle_request(self, request: Request, files: List[UploadFile] = File(
             repetition_penalty=chat_request.repetition_penalty if chat_request.repetition_penalty else 1.03,
             streaming=stream_opt,
             language=chat_request.language if chat_request.language else "auto",
+            model=chat_request.model if chat_request.model else None
         )
         result_dict, runtime_graph = await self.megaservice.schedule(
             initial_inputs={"query": prompt}, llm_parameters=parameters