That is not possible with this plugin, the results page is a theme/page builder feature that the plugin cannot control.
If you are importing the cars via a plugin, which does not trigger the “save_post” or other mandatory hooks, then it needs to be indexed – otherwise it is automatically added when saving the posts. Instead of constantly reindexing, I recommend using the automatic crond indexing feature: https://i.imgur.com/b2xvfaC.png
