Treffer: Reranking Hits in Public Library Catalog Search with Popularity and Freshness Boosting.

The Oslo public library (Deichman) offers search functionality to its catalog over Elasticsearch. For interested patrons, it offers control over two reranking parameters, AgeGain and ItemGain, that allow for boosting the influence of freshness and popularity, respectively, for individual searches. In this paper, we explore the effect of these parameters on several retrieval scenarios and their effect on the quality of retrieval in the Deichman case. We find that whereas AgeGain has little effect on the search result, high values of ItemGain boost known-Item search but may have undesired consequences for topical search, as expressed through traditional retrieval measures. [ABSTRACT FROM AUTHOR]