53. The computer-implemented method as recited in claim 35 , wherein each query request includes: a bucket identifier that identifies a particular searchable index in the searchable data service, wherein a bucket defines the scope of a query request to the searchable data service; and a query expression that specifies one or more search criteria to be applied to specified attributes of the searchable index identified by the bucket identifier to locate searchable data service objects that satisfy the query expression.
53. The computer-implemented method as recited in claim 35 , wherein each query request includes: a bucket identifier that identifies a particular searchable index in the searchable data service, wherein a bucket defines the scope of a query request to the searchable data service; and a query expression that specifies one or more search criteria to be applied to specified attributes of the searchable index identified by the bucket identifier to locate searchable data service objects that satisfy the query expression. 54. The computer-implemented method as recited in claim 53 , wherein each query request further includes a subscriber identifier that uniquely identifies a particular subscriber to the searchable data service, wherein each subscriber identifier is associated with one or more bucket identifiers in the searchable data service, and wherein each bucket identifier is associated with exactly one subscriber.