FAQ live search automatically searches FAQs for matching documents when the user tries to open a new ticket. As the user types in to the TOPIC field, a list FAQs matching keywords in the topic is shown to the user.
This is very useful since it can prevent a customer from submitting a ticket if an answer already exists to their question.
Live search is automatically enabled when the FAQ add-on is installed. To configure how it works you can go to the FAQs->SETTINGS->Live Search tab.