text: RocketChat.Migrations.add({
  	version: 4,
  	up() {
  		RocketChat.models.Messages.tryDropIndex('rid_1');
  		RocketChat.models.Subscriptions.tryDropIndex('u._id_1');
  
  		console.log('Rename rn to name');
  
  		RocketChat.models.Subscriptions.update({
  			rn: {
  				$exists: true,
  			},
  		}, {
  			$rename: {
  				rn: 'name',
  			},
  		}, {
  			multi: true,
  		});
  
  		console.log('Adding names to rooms without name');
  
  		RocketChat.models.Rooms.find({
  			name: '',
  		}).forEach((item) => {
  			const name = Random.id().toLowerCase();
  
  			RocketChat.models.Rooms.setNameById(item._id, name);
  
  			return RocketChat.models.Subscriptions.update({
  				rid: item._id,
  			}, {
  				$set: {
  					name,
  				},
  			}, {
  				multi: true,
  			});
  		});
  
  		console.log('Making room names unique');
  
  		RocketChat.models.Rooms.find().forEach(function(room) {
  
  			return RocketChat.models.Rooms.find({
  				name: room.name,
  				_id: {
  					$ne: room._id,
  				},
  			}).forEach((item) => {
  				const name = `${ room.name }-${ Random.id(2).toLowerCase() }`;
  
  				RocketChat.models.Rooms.setNameById(item._id, name);
  
  				return RocketChat.models.Subscriptions.update({
  					rid: item._id,
  				}, {
  					$set: {
  						name,
  					},
  				}, {
  					multi: true,
  				});
  			});
  		});
  
  		return console.log('End');
  	},
  });
  