AT:

• distribution includes upgrade scripts to run the upgrade for convenience
• update documentation is updated to refer to the scripts instead of the java command (/technical-guide/update/)
• no manual classpath modification from upgrade classes, see UpgradeExecutionPlan#addEnvironmentFolderToClasspath (cause of SUPPORT-5269) provide full needed classpath in script instead (like done for backend itself & reimport)

Notes:
Consider adding backend.jar to classpath and remove shade plugin from upgrade build to reduce overall distribution size.