# Data Quality: migration

| Item | Description | Available in |
| --- | --- | --- |
| Indexes | Lucene has been upgraded to version 8.<br><br>If the indexes were created with<br>version 7.2 or earlier, you need to migrate them. The location of the migration<br>procedure depends on the Studio installation:<br><br><ul> <li>With the installer:                              <span>/addons/scripts/Lucene_Migration_Tool/README.md</span> </li> <li>With no installer: in the license email, click the link in <em>Migration tool for Lucene Indexes from version 4 to                              version 8</em> </li> </ul> | <ul>Available in:<li>Big Data Platform</li><li>Data Fabric</li><li>Data Management Platform</li><li>Data Services Platform</li><li>MDM Platform</li><li>Real-Time Big Data Platform</li></ul><br><br>All Talend<br>on-premises Platform products and Talend Data Fabric |