1. A method comprising: partitioning, by a reverse index system having one or more computers, search query terms to form partitioned sets of the search query terms, wherein the partitioning comprises partitioning the search query terms into the partitioned sets based on co-occurrence of given ones of the search query terms in a particular query, wherein co-occurrence of the given ones of the search query terms in the particular query comprises the given search query terms co-occurring in the particular query; distributing the partitioned sets of the search query terms to a plurality of index servers of said reverse index system, wherein the distributing includes generating a distribution map that maps the partitioned sets of the search query terms to corresponding ones of the plurality of index servers; using said distribution map to index links to content nodes to said partitioned sets of the search query terms; and using said distribution map for processing queries received from browser nodes.