If your Query Suggestions source index has NeuralSearch enabled, then the Query Suggestions engine will perform a stricter check against the Minimum Hits requirement that you have configured before accepting the query.
The Query Suggestions engine checks the source index by running an exact search with the potential suggestion. It counts how many keyword hits appear within the first 20 total hits (including semantic hits). If the number of keyword hits is less than the Minimum Hits requirement that you have configured, then the suggestion will be rejected.
For example, if your potential suggestion is "apple":
- the Minimum Hits configuration for your Query Suggestions index is 5
- your NeuralSearch source index returns 30 total hits for the query "apple"
- only 4 of the first 20 hits are keyword hits; the other 16 are semantic
"apple" will not be added to your Query Suggestions index.