Response Pairwise Swap Stage
This is a response rewriting stage that helps “de-bias” results by swapping the search results at any two positions, such as positions 1 and 2, positions 3 and 4, and so on. This stage must be used after the Solr Query stage in your pipeline.
This stage is especially useful when combined with experiments, where a small percentage of traffic is given swapped results to minimize position bias when using click signals for ranking. The Response Shuffle stage provides an another method for minimizing this bias.