code: def request_proto_bytes():
      doc_count = 1000
      r = DataRequest()
      da = r.docs
      da.extend(
          [Document(text="534534534er5yr5y645745675675675345")]
          * doc_count
      )
      r.data.docs = da
      return DataRequestProto.SerializeToString(r)
  
imports: import copy
  import pytest
  from docarray import Document, DocumentArray
  from google.protobuf.json_format import MessageToDict, MessageToJson
  from jina.excepts import BadRequestType
  from jina.helper import random_identity
  from jina.proto import jina_pb2
  from jina.proto.serializer import DataRequestProto
  from jina.types.request.data import DataRequest, Response
label_desc: Use image node_id 20 for calling a global function with example usage: request_proto_bytes() and returns: DataRequestProto