Products beyond their End-of-Life (EOL) date will no longer receive maintenance or updates. CodeLibs Project strongly recommends migrating to a supported release. This prevents situations where necessary services and support become unavailable. The latest release can be downloaded from the download page.
If support is needed for products beyond their End-of-Life period, please consult commercial support.
Warning
Recommended Actions Before End of Support
Before the support end date, please plan and execute the following actions:
Create backups: Back up configuration files and index data
Test in staging environment: Verify operation with the new version before production migration
Review release notes: Check for breaking changes and deprecated features
Plan migration schedule: Create a plan considering downtime requirements
Upgrade Path
The following table shows the recommended upgrade path from your current version to the latest release.
| Current Version | Recommended Path | Notes |
|---|---|---|
| 15.x to 15.5 | Direct upgrade possible | See Upgrade Guide |
| 14.x to 15.5 | Direct upgrade possible | Pay attention to configuration file changes |
| 13.x to 15.5 | Via 14.x recommended | Upgrade in order: 13.x to 14.19 to 15.5 |
| 12.x or earlier to 15.5 | Staged upgrade required | Upgrade 1-2 major versions at a time |
Note
For detailed upgrade procedures, see the Upgrade Guide. For large-scale environments or complex configurations, we recommend consulting commercial support.
Migration Resources
Useful documents for upgrading:
Upgrade Guide - Detailed steps from backup to upgrade completion
Release Notes - Changes and notes for each version
Troubleshooting - Common problems and solutions
Docker Upgrade - Upgrading in Docker environments
Maintenance Table
The EOL date for Fess is approximately 18 months after release.
Legend:
🟢 Supported: Security fixes and bug fixes are provided
🟡 Nearing End of Support: Support ends within 6 months
🔴 End of Support: No maintenance is provided
Currently Supported Versions
| Fess | EOL Date | Status |
|---|---|---|
| 15.5.x | 2027-08-01 | 🟢 Latest (Recommended) |
| 15.4.x | 2027-06-01 | 🟢 Supported |
| 15.3.x | 2027-04-01 | 🟢 Supported |
| 15.2.x | 2027-03-01 | 🟢 Supported |
| 15.1.x | 2027-01-01 | 🟢 Supported |
| 15.0.x | 2026-12-01 | 🟢 Supported |
| 14.19.x | 2026-08-01 | 🟡 Nearing End of Support |
| 14.18.x | 2026-05-01 | 🟡 Nearing End of Support |
| 14.17.x | 2026-03-01 | 🔴 End of Support |
| 14.16.x | 2026-02-01 | 🔴 End of Support |
| 14.15.x | 2026-01-01 | 🔴 End of Support |
End-of-Life Versions
| Fess | EOL Date |
| 14.14.x | 2025-11-01 |
| 14.13.x | 2025-10-01 |
| 14.12.x | 2025-08-01 |
| 14.11.x | 2025-04-01 |
| 14.10.x | 2025-01-01 |
| 14.9.x | 2024-12-01 |
| 14.8.x | 2024-11-01 |
| 14.7.x | 2024-09-01 |
| 14.6.x | 2024-07-01 |
| 14.5.x | 2024-05-01 |
| 14.4.x | 2024-02-24 |
| 14.3.x | 2023-12-28 |
| 14.2.x | 2023-10-26 |
| 14.1.x | 2023-09-08 |
| 14.0.x | 2023-08-08 |
| 13.16.x | 2023-06-07 |
| 13.15.x | 2023-03-22 |
| 13.14.x | 2023-02-03 |
| 13.13.x | 2022-11-25 |
| 13.12.x | 2022-09-23 |
| 13.11.x | 2022-08-10 |
| 13.10.x | 2022-05-11 |
| 13.9.x | 2022-02-18 |
| 13.8.x | 2021-12-18 |
| 13.7.x | 2021-11-13 |
| 13.6.x | 2021-08-11 |
| 13.5.x | 2021-06-02 |
| 13.4.x | 2021-04-01 |
| 13.3.x | 2021-01-31 |
| 13.2.x | 2020-12-25 |
| 13.1.x | 2020-11-20 |
| 13.0.x | 2020-10-10 |
| 12.7.x | 2020-11-20 |
| 12.6.x | 2020-09-26 |
| 12.5.x | 2020-07-29 |
| 12.4.x | 2020-05-14 |
| 12.3.x | 2020-02-23 |
| 12.2.x | 2020-12-13 |
| 12.1.x | 2019-08-19 |
| 12.0.x | 2019-06-02 |
| 11.4.x | 2019-03-23 |
| 11.3.x | 2019-02-14 |
| 11.2.x | 2018-12-15 |
| 11.1.x | 2018-11-11 |
| 11.0.x | 2018-08-13 |
| 10.3.x | 2018-05-24 |
| 10.2.x | 2018-02-30 |
| 10.1.x | 2017-12-09 |
| 10.0.x | 2017-08-05 |
| 9.4.x | 2016-11-21 |
| 9.3.x | 2016-05-06 |
| 9.2.x | 2015-12-28 |
| 9.1.x | 2015-09-26 |
| 9.0.x | 2015-08-07 |
| 8.x | 2014-08-23 |
| 7.x | 2014-02-03 |
| 6.x | 2013-09-02 |
| 5.x | 2013-06-15 |
| 4.x | 2012-06-19 |
| 3.x | 2011-09-07 |
| 2.x | 2011-07-16 |
| 1.x | 2011-04-10 |
Frequently Asked Questions
Q: Can I continue using Fess after the support period ends?
A: Technically it is possible, but security fixes and bug fixes will not be provided. To mitigate security risks, we strongly recommend upgrading to a supported version.
Q: How long does an upgrade take?
A: It depends on the scale of your environment, but typically 2 to 4 hours. For large-scale environments or complex configurations, we recommend testing in a staging environment first. See the Upgrade Guide for details.
Q: What should I do if I encounter a problem with an end-of-life version?
A: You have the following options:
Upgrade to the latest version: The recommended action
Ask on community forums: You may be able to get advice from other users
Consult commercial support: N2SM commercial support can provide maintenance for specific versions
Q: What should I check before upgrading?
A: Please verify the following:
Check Release Notes for breaking changes
Verify OpenSearch version compatibility
If you have customizations, check compatibility of settings and plugins
Create thorough backups
Q: Does upgrading in a Docker environment require special steps?
A: You will need to back up Docker volumes and obtain the new Docker Compose files. See the Docker Installation Guide for details.