An example non-transitory storage medium stores computer-executable instructions for execution by one or more hardware processors to perform operations including: receiving at a server a request for a list of a first group of index records that correspond to stored data; creating a data streaming session with a client; reading an index file and obtaining a list of the first group of index records from the index file; populating a content cache with a signature that corresponds to the first group of index records; creating a sliding window and populating it with the signature and a pointer to a next group of index records; populating an attribute cache with data streaming session information and the sliding window; creating a continuation token which, when received by the server from the client, indicates to the server that the list of the first group of index records has been received by the client.