I dont think vbulletin will switch to internal search just because you dropped the index.
As far as your vb is concerned, it still thinks the fulltext index is there. For example, I believe the 'similar threads' feature will try to use the fulltext index and so if you have that enabled you might get some errors. I'm not sure where else vB will try to use the fulltext index.
To change to local search you will need to use the 'Search Type' setting from admincp.
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