Omnisearch Replacement Plugin?

Can anyone recommend a plugin that will do what Omnisearch use to do?

Specifically: I need to search all posts and pages on a site for a specific shortcode.

I know there is a stand alone Omisearch plugin. It crashes every site I install it on so that’s not useful.

Searching the plugin directory turns up plugins that provide search for the front end. Not what I’m looking for.

Thanks much.