25. The system of claim 16 , where, when the one or more processors are to adjust the score of the particular document, the one or more processors are further to: adjust an index score, associated with the particular document, based on the correction factor, and where the one or more processors are further to: determine whether to include the particular document in a document index based on the adjusted index score.
16. A system comprising: one or more server devices comprising: one or more memory devices to store instructions; and one or more processors to execute the instructions to: obtain a rank position map, the rank position map specifying, for a plurality of rank positions, an expected utility rate for a document presented at a particular one of the plurality of rank positions as a search result, the expected utility rate being derived from an aggregate quantity of selections of the document presented as a search result at the particular one of the plurality of rank positions; determine an expected utility rate, for a particular document, based on the obtained rank position map and based on a quantity of times that the particular document was presented as a search result at particular ones of the plurality of rank positions; determine an actual utility rate for the particular document based on an actual quantity of selections of the particular document and based on a total quantity of times that the particular document was presented as a search result; calculate a correction factor, for the particular document, based on the determined expected utility rate and the determined actual utility rate; determine a confidence level for the correction factor, the confidence level representing a measure of confidence associated with the correction factor; adjust the correction factor based on the determined confidence level; select, based on determining that the confidence level is less than a threshold, a set of documents, the particular document being included in the set of documents; calculate an aggregated correction factor for the set of documents; use the aggregated correction factor as the correction factor for the particular document; adjust a score of the particular document based on the correction factor; and provide, for presentation, a ranked list of search results, one of the search results corresponding to the particular document, and a ranking of the search result corresponding to the particular document being based on the adjusted score.