Sentry Upgrade from 9.0 to 9.1.2

When we try to upgrade from sentry 9.0 to 9.1.2,we are facing below error,could anyone help us on the same.

(use ./manage.py migrate to migrate these)
Running migrations for sentry:
 - Migrating forwards to 0423_auto__add_index_grouphashtombstone_deleted_at.
 > sentry:0365_auto__del_index_eventtag_project_id_key_id_value_id
FATAL ERROR - The following SQL query failed: DROP INDEX CONCURRENTLY sentry_eventtag_project_id_42979ba214ba3c43
The error was: ProgrammingError('index "sentry_eventtag_project_id_42979ba214ba3c43" does not exist\n',)
SQL: DROP INDEX CONCURRENTLY sentry_eventtag_project_id_42979ba214ba3c43
FATAL ERROR - The following SQL query failed: DROP INDEX sentry_eventtag_project_id_42979ba214ba3c43
The error was: ProgrammingError('index "sentry_eventtag_project_id_42979ba214ba3c43" does not exist\n',)
SQL: DROP INDEX sentry_eventtag_project_id_42979ba214ba3c43
Traceback (most recent call last):
  File "/usr/local/bin/sentry", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/site-packages/sentry/runner/__init__.py", line 162, in main
    cli(prog_name=get_prog(), obj={}, max_content_width=100)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/sentry/runner/decorators.py", line 36, in inner
    return ctx.invoke(f, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/sentry/runner/commands/upgrade.py", line 67, in upgrade
    _upgrade(not noinput, traceback, verbosity, not no_repair)
  File "/usr/local/lib/python2.7/site-packages/sentry/runner/commands/upgrade.py", line 29, in _upgrade
    verbosity=verbosity,
  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 159, in call_command
    return klass.execute(*args, **defaults)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/site-packages/south/management/commands/migrate.py", line 115, in handle
    ignore_ghosts=ignore_ghosts,
  File "/usr/local/lib/python2.7/site-packages/south/migration/__init__.py", line 234, in migrate_app
    success = migrator.migrate_many(target, workplan, database)
  File "/usr/local/lib/python2.7/site-packages/south/migration/migrators.py", line 256, in migrate_many
    result = migrator.__class__.migrate_many(migrator, target, migrations, database)
  File "/usr/local/lib/python2.7/site-packages/south/migration/migrators.py", line 341, in migrate_many
    result = self.migrate(migration, database)
  File "/usr/local/lib/python2.7/site-packages/south/migration/migrators.py", line 132, in migrate
    result = self.run(migration, database)
  File "/usr/local/lib/python2.7/site-packages/south/migration/migrators.py", line 291, in run
    return super(Forwards, self).run(migration, database)
  File "/usr/local/lib/python2.7/site-packages/south/migration/migrators.py", line 114, in run
    return self.run_migration(migration, database)
  File "/usr/local/lib/python2.7/site-packages/south/migration/migrators.py", line 92, in run_migration
    south.db.db.rollback_transaction()
  File "/usr/local/lib/python2.7/site-packages/south/db/generic.py", line 1037, in rollback_transaction
    transaction.leave_transaction_management(using=self.db_alias)
  File "/usr/local/lib/python2.7/site-packages/django/db/transaction.py", line 78, in leave_transaction_management
    get_connection(using).leave_transaction_management()
  File "/usr/local/lib/python2.7/site-packages/django/db/backends/__init__.py", line 310, in leave_transaction_management
    "This code isn't under transaction management")
django.db.transaction.TransactionManagementError: This code isn't under transaction management

we are using docker containers for sentry and linking psql which is configured in aws rds.
Host machine is amazon linux 2.

During Sentry upgrade, will the PSQL database will get any issues related INDEX recreation or something like that? Or is this a bug?
It will be great of someone, provide some information to resolve the issue.

@BYK @matt any suggestions for this issue?

Why does this not exist? As a workaround perhaps you could manually create an index with that name and then rerun, but without understanding the root cause it seems likely that you’ll run into additional obstacles.