By default, ExtremeZ-IP automatically re-indexes file entries for its indexed search. But you can use EZIPUTIL in a batch file or script to schedule re-indexing on a set schedule during off-hours and trigger it with a scheduling service of your choice.
You can also use it in a script or batch file to schedule re-indexing during off-hours:
EZIPUTIL VOLUME /REINDEX /NAME:volumename /PATH:root directory path [/SERVICENAME:servicename]
SERVICENAME is needed only if ExtremeZ-IP is running on a cluster.