16. Non-transitory physical computer storage comprising computer-executable instructions stored thereon that, when executed by a hardware processor, are configured to perform operations comprising: accessing, from an electronic data store that stores search session query log data, query pair frequency data indicative of how often a plurality of query pairs appear in search session logs associated with an electronic catalog; generating a query cluster based at least in part on the accessed query pair frequency data by clustering the query pairs, said query cluster comprising at least two query terms determined to be highly correlated based at least in part on said clustering; generating an item descriptor cluster comprising two or more query terms associated with the query cluster; executing a search request on the electronic catalog using the item descriptor cluster to generate an item cluster comprising at least one item having an attribute corresponding to at least one of the two or more query terms; and providing an item recommendation comprising the at least one item.
16. Non-transitory physical computer storage comprising computer-executable instructions stored thereon that, when executed by a hardware processor, are configured to perform operations comprising: accessing, from an electronic data store that stores search session query log data, query pair frequency data indicative of how often a plurality of query pairs appear in search session logs associated with an electronic catalog; generating a query cluster based at least in part on the accessed query pair frequency data by clustering the query pairs, said query cluster comprising at least two query terms determined to be highly correlated based at least in part on said clustering; generating an item descriptor cluster comprising two or more query terms associated with the query cluster; executing a search request on the electronic catalog using the item descriptor cluster to generate an item cluster comprising at least one item having an attribute corresponding to at least one of the two or more query terms; and providing an item recommendation comprising the at least one item. 19. The non-transitory physical computer storage of claim 16 , wherein the session query logs are gathered over a period of years.