[skip ci] Remove check for topk in mishards (fix #3709) (#3710)

Signed-off-by: yinghao.zou <yinghao.zou@zilliz.com>

CHANGELOG.md

@@ -6,6 +6,7 @@ Please mark all change in change log and use the issue from GitHub
 ## Bug
 -   \#3536 Release search task in time to avoid excessive memory usage
 -   \#3656 Fix to check search params 'nprobe' of BIN_IVF_FLAT
+-   \#3709 Remove check for topk in mishards
 
 ## Feature
 -   \#3213 Allow users to specify a distance type at runtime for Flat index

shards/mishards/service_handler.py

@@ -317,9 +317,9 @@ class ServiceHandler(milvus_pb2_grpc.MilvusServiceServicer):
         #     raise exceptions.InvalidArgumentError(
         #         message='Invalid nprobe: {}'.format(nprobe), metadata=metadata)
 
-        if topk > self.MAX_TOPK or topk <= 0:
-            raise exceptions.InvalidTopKError(
-                message='Invalid topk: {}'.format(topk), metadata=metadata)
+        # if topk > self.MAX_TOPK or topk <= 0:
+        #     raise exceptions.InvalidTopKError(
+        #         message='Invalid topk: {}'.format(topk), metadata=metadata)
 
         collection_meta = self.collection_meta.get(collection_name, None)