18. The method of claim 17 , wherein the second query segment filter is selected from the group consisting of an engine variant filter, a user attribute filter, an item attribute filter, and a query attribute filter.
17. The method of claim 11 , further comprising: applying a second query segment filter to the plurality of queries to generate a second replay group of queries; for each query in the second replay group, generating utilizing the engine variant a corresponding predicted result, receiving a corresponding actual result, and computing a corresponding prediction score based on the corresponding predicted result and the corresponding actual result; grouping queries in the second replay group into one or more query segments of the second replay group according to the timestamps; and generating, as a replay of the performance of the engine variant, a second accumulated prediction score over each of the one or more query segments of the second replay group by applying the accumulation function.