fix slack cvs user importer (#16253)

app/importer-slack-users/server/importer.js

@@ -102,7 +102,7 @@ export class SlackUsersImporter extends Base {
 							// since we have an existing user, let's try a few things
 							userId = existantUser._id;
 							u.rocketId = existantUser._id;
-							Users.update({ _id: u.rocketId }, { $addToSet: { importIds: u.id } });
+							Users.update({ _id: u.rocketId }, { $addToSet: { importIds: u.user_id } });
 
 							Users.setEmail(existantUser._id, u.email);
 							Users.setEmailVerified(existantUser._id, u.email);
@@ -117,7 +117,7 @@ export class SlackUsersImporter extends Base {
 							Meteor.runAsUser(userId, () => {
 								Meteor.call('setUsername', u.username, { joinDefaultChannelsSilenced: true });
 								Users.setName(userId, u.name);
-								Users.update({ _id: userId }, { $addToSet: { importIds: u.id } });
+								Users.update({ _id: userId }, { $addToSet: { importIds: u.user_id } });
 								Users.setEmail(userId, u.email);
 								Users.setEmailVerified(userId, u.email);
 								u.rocketId = userId;