gerrit:3.6.8 upgrade issue - Unloading plugin

[Rupesh Sadawarte]

We are running Gerrit on Docker container with external PostgreSQL14 database.
I am upgrading Gerrit from version gerrit:3.6.8 to gerrit:3.8.10 but after initialization and reindexing, Gerrit is not staring and again asking to reindex.
I had same issue with upgrading to 3.9.

I saw some post asking to offline reindexing. How can I do the offline reindexing for container?

Upgrade Steps
Stopped Gerrit 3.6.8.
Started a new container with Gerrit 3.8.10.
Ran init successfully.
Executed full reindexing.
Restarted Gerrit.

container logs

Reindexing changes: changes: 97% (35030/36106), failed: 1076, project-slices: 100% (1045/1045), Slicing projects: 100% (3857/3857), done
[main] WARN  com.google.gerrit.server.index.change.AllChangesIndexer : Failed 1076/36106 changes
Reindexed 36106 documents in changes index in 439.1s (82.2/s)
Index changes in version 82 is ready
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin replication, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin codemirror-editor, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin gitiles, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin reviewnotes, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin download-commands, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin commit-message-length-validator, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin webhooks, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin delete-project, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin plugin-manager, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin singleusergroup, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin hooks, version v3.8.10
[main] INFO  com.google.gerrit.server.plugins.PluginLoader : Unloading plugin uploadvalidator, version v3.0.0-rc1-315-g829830aa41
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_replication_260601_1541_2941988839504062335.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_codemirror-editor_260601_1541_6120392252777409188.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_gitiles_260601_1541_6341111236244939024.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_reviewnotes_260601_1541_3517140420450803412.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_download-commands_260601_1541_4559117251866270034.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_commit-message-length-validator_260601_1541_6594402674296745130.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_webhooks_260601_1541_8251459100933591503.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_delete-project_260601_1541_8251336349597987608.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_plugin-manager_260601_1541_12217327669926147616.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_singleusergroup_260601_1541_1993443263018656406.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_hooks_260601_1541_2811209654855309256.jar
[main] INFO  com.google.gerrit.server.plugins.CleanupHandle : Cleaned plugin plugin_uploadvalidator_260601_1541_8034177937182154131