redis upgrade error while redis is running

redis server is running while the upgrade to 4.0.9 happens. is it expected that the redis server is first shut down before the upgrade is rolled out?

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: redis-server 5:4.0.9-1
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Mon Oct 1 14:16:46 2018
ErrorMessage: installed redis-server package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2017-09-20 (376 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: redis
Title: package redis-server 5:4.0.9-1 failed to install/upgrade: installed redis-server package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-09-27 (3 days ago)