How to update the ElasticSearch index When new Files are in

Nextcloud version _: 16.0.4
Operating system and version : CentOS7
PHP version _:7.2

We are trying to figure out how often the index is refreshed on nextcloud (elastic search) within 1 hour…can we change the frequency on a config file…?

live textsearch?

yes we are using live text search …the problem we are facing is although the live text search is updating files added to internal storage …it is not updating any files which are added to external storage…