Renamed channel index fix migration key (#24061)

Automatic Merge

server/public/model/migration.go

@@ -40,5 +40,5 @@ const (
 	MigrationKeyAddPlayboosksManageRolesPermissions    = "playbooks_manage_roles"
 	MigrationKeyAddProductsBoardsPermissions           = "products_boards"
 	MigrationKeyAddCustomUserGroupsPermissionRestore   = "custom_groups_permission_restore"
-	MigrationKeyElasticsearchFixChannelIndex           = "elasticsearch_fix_channel_index_migration_complete"
+	MigrationKeyElasticsearchFixChannelIndex           = "elasticsearch_fix_channel_index_migration"
 )