code: def get_merge_request(self, project, repository_name_or_id, merge_operation_id, include_links=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if repository_name_or_id is not None:
              route_values['repositoryNameOrId'] = self._serialize.url('repository_name_or_id', repository_name_or_id, 'str')
          if merge_operation_id is not None:
              route_values['mergeOperationId'] = self._serialize.url('merge_operation_id', merge_operation_id, 'int')
          query_parameters = {}
          if include_links is not None:
              query_parameters['includeLinks'] = self._serialize.query('include_links', include_links, 'bool')
          response = self._send(http_method='GET',
                                location_id='985f7ae9-844f-4906-9897-7ef41516c0e2',
                                version='5.1-preview.1',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('GitMerge', response)
docs: GetMergeRequest.
          [Preview API] Get a specific merge operation's details.
          :param str project: Project ID or project name
          :param str repository_name_or_id: The name or ID of the repository.
          :param int merge_operation_id: OperationId of the merge request.
          :param bool include_links: True to include links
          :rtype: :class:`<GitMerge> <azure.devops.v5_1.git.models.GitMerge>`