Search Fatigue has been studied for many years, at least since the 1970s. Economists define search fatigue as the point at which a consumer stops searching for a product or service at a desired value point. In the Searchable Web Ecosystem (which consists of Publishers, Indexers, and Searchers) only the Indexers are in a position to measure search fatigue for the whole population of Searchers. Each Searcher knows when he or she becomes fatigued, but Publishers know nothing about when a Searcher becomes fatigued or why a Searcher chooses a given listing in a search result.
This blind spot in Publisher analytics has been there from the very start. Although we once received much more complete referral data from major search engines like Bing and Google, they withheld all data pertaining to search fatigue.http://www.seo-theory.com/2015/09/30/search-fatigue-and-queries-of-last-resort/