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. 55. The computer-implemented method as recited in claim 53 , wherein a query expression includes: one or more attributes of a searchable data service object in the particular searchable index; and one or more operators to be applied to the one or more attributes in the query expression to locate a set of searchable data service objects that satisfy the query expression in the particular searchable index.