2. The method of claim 1 , comprising: ranking the search results included in the set of search results that includes (i) the one or more of the search results that were identified using the initial search query and (ii) the one or more of the search results that were identified using the one or more revised search queries; determining, using the query log data, that a search result that is ranked above the particular search result is one of the search results that were identified using the one or more revised search queries; and in response to determining that the search result that is ranked above the particular search result is one of the search results that were identified using the one or more revised search queries, adjusting a skip count for the one or more query term optionalization rules that are specific to the particular query term.
2. The method of claim 1 , comprising: ranking the search results included in the set of search results that includes (i) the one or more of the search results that were identified using the initial search query and (ii) the one or more of the search results that were identified using the one or more revised search queries; determining, using the query log data, that a search result that is ranked above the particular search result is one of the search results that were identified using the one or more revised search queries; and in response to determining that the search result that is ranked above the particular search result is one of the search results that were identified using the one or more revised search queries, adjusting a skip count for the one or more query term optionalization rules that are specific to the particular query term. 5. The method of claim 2 , comprising assigning a score to the one or more query term optionalization rules that are specific to the particular query term based at least on the click count and the skip count.