Documentum come with its own ranking formula. Administrator has no way to fine tune the configuration to integrate with other open source search engine. Rank normalization can be achieve through user feedback. Simply user themselves vote and assert priority on the individual search engine. How to determine the voting? For every search result the user and selected, the respective search engine vote will plus one. therefore the next search query, The higher vote search engine get to display more result as compare to the remaining search engine. However there always a fixed threshold to ensure at least each search engine got a chance to display some result for example 5 articles.
Simplest approach - set a fixed number of results for each search engine. Equal priority is assign to each search engine. Total result = Set( top 5 elements from SE01 ..... SE0X )
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