To upgrade from a previous version, see the following steps.
Configuration data are in the following files:
.fess_basic_config and .fess_user from Backup page(For more details, see Backup of Administration Guide)
system.properties in /etc/fess or app/WEB-INF/conf
fess_config.properties in /etc/fess or app/WEB-INF/conf
Stop Fess and then install RPM/DEB package, see Installation in Installation Guide.
Fess 12 requires Elasticsearch 6.x, and indices for Fess 12 is not compatible with Fess 11.x. To upgrade to Elasticsearch 6, remove old indices and then upgrade Elasticsearch package. For Elasticsearch plugins, if you upgrade Elasticsearch, re-install all Elasticsearch plugins for the proper Elasticsearch version.
Check and merge settings in fess_config.properties, and then start Fess.
For Fess 11, to restore data, upload .fess_basic_config.12 and .fess_user.12 bulk files on Backup page.
For Fess 12, execute migration process on Upgrade page. For more details, see Upgrade of Administration Guide.
To create new search indices, start Default Crawler job on Scheduler page.