1. A method, comprising: at a computing device having one or more processors and memory: selecting a first document in a plurality of documents on the basis that the first document is associated with a query independent score, wherein the first document has a fingerprint that indicates that the first document has substantially identical content to every other document in the plurality of documents; indexing, in accordance with the query independent score, the first document thereby producing an indexed first document; and with respect to the plurality of documents, including only the indexed first document in a document index.