https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=39790

--- Comment #2 from Nick Clemens (kidclamp) <[email protected]> ---
Marking NSO, this can be tested, but I think there are some things to consider.

I am removing relevancy from the search for each point, this could mean that
combining across different fields could not get the same matches, however, this
is currently a problem with splitting the searches anyways. There is no
guarantee the most relevant for a title match are the most relevant for an
author match. 

Matches should really be on fields that are unique to the two records to limit
large sets, especially as we limit to 10 matches by default.

For an author with 100 books we cannot expect to always get the matching title
in the top 10 - with or without relevancy - as ideally the author field would
all match and have equal relevancy.

I think we need to combine all the searches into a single search, but that will
take more refactoring and I suspect this will improve the search cost.

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