Hello,
Full reindexing is not recommended unless advised by Adobe Support. Few cases where it could be necessary:
- Corrupt nodes exist under an index.
- The index is out of sync with the rest of the repository due to some issues in Oak.
- The index definition has been updated with new configurations. Reindexing in this circumstance should be done during a maintenance window to avoid affecting users on the system.
Check the best practices: https://docs.adobe.com/content/help/en/experience-manager-65/deploying/practices/best-practices-for-...