Missing-indices Freenas Jail

Nextcloud version _ 14.0.2:
Operating system and version _Freenas
Apache 2.4.25:
PHP version _7.1:

After upgrading to 14.01 and again to 14.02 I receive this error message in settings:

The database is missing some indexes. Due to the fact that adding indexes on big tables could take some time they were not added automatically. By running “occ db:add-missing-indices” those missing indexes could be added manually while the instance keeps running. Once the indexes are added queries to those tables are usually much faster.

I have next to zero programming experience and just do not know how to run the occ command within the Freenas Jail. I have seen explanations on what to do in the case of a Linux installation.

Any help is appreciated.

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