1. A method, comprising: at a computing device having one or more processors and memory: obtaining a plurality of documents, wherein a respective document in the plurality of document is associated with a query independent score; selecting a first document in the plurality of documents in accordance with a query independent score associated with the first document, 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.