20. The method of claim 15 , further comprising: identifying, based on processing the query, one or more documents based on the query; scoring the one or more identified documents, where the extra term, when identified as significant, contributes an amount that is equal to an amount contributed by another term of the query to a score of one of the one or more identified documents; and providing a list of search results based on the one or more identified documents and the scoring.
15. A method comprising: analyzing, by a processor in a computer system, query logs to identify a pair of queries that are the same except that a first query, in the pair of queries, includes an extra term that is not included in a second query in the pair of queries; identifying, by a processor in the computer system, whether the pair of queries is associated with a quantity of search results that are different between the pair of queries; identifying, by a processor in the computer system, the extra term as a term that is significant when the pair of queries is associated with at least a threshold quantity of search results that are different between the pair of queries; and processing, by a processor in the computer system, a query that includes the extra term based on identifying the extra term as a term that is significant.