Have SearchWP take over WP Job Manager (and associated WP Job Manager add-ons) searches.
WP Job Manager is a popular, well written job board plugin with a thriving add-on library. WP Job Manager offers various search implementations for itself and add-ons. If you would like to enhance the keyword (only) aspect of those search fields, WP Job Manager Integration will do the trick. Just by activating WP Job Manager Integration you’ll automatically enable SearchWP to handle the keyword search field for both WP Job Manager core and the Resume add-on. All of the other filters will remain functional an untouched, this extension merely restricts the keyword-provided results.