It seems like there should be an easy way to do this, it would be a great feature. Here are some workarounds you can try…

Customized Module Definition:
Install a second copy of the Html/Text module but disable support for ISearchable. You could call it Html/Text (w/o) search for example. If you omit the businesscontrollerclass from the module definition, search will be disabled. Unfortunately you’d also lose IPortable.

Customized Business Controller Class:
You could replace the businesscontrollerclass for the module with a custom version that could conditionally enable/disable search for the module.

Modify DNN Core (just a little)
I haven’t tried this, but it should work…
You could modify the stored procedure GetSearchModules to filter out modules with a custom module setting, say DisableSearch=True. Then you could add that module setting to any module you want excluded from the search.

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Thanks for the advice, i changed sp GetSearchResults so it just included modules i wanted and it works.