Global Search returns objects which do not relate to the query. How to understand the scoring it does?

I am using Global Search 5.0.0 . When I enclose the search string in quotes, like "My search string", then it returns the exact match. However, when I simply type text, the top selected entries have nothing to do with the query. That is, the entry which would be the perfect match is ranked way closer to the end of the response list. Does anybody else experience the same behavior? Is there a way to know the ranking Lucene assigns to each response to better understand why entries are returned in the order they are returned?
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