Formatting custom cron action

I created this function, which I named nightly_search_index:

function nightly_search_index () {
    relevanssi_build_index();
};
add_action('nightly_search_index', 'nightly_search_index');

relevanssi_build_index(); is a function I’m trying to schedule from another plugin.

I am not sure about the params for add_action? I thought I read somewhere to name the same, but can’t find where that was… Thanks.

j

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