https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=38694
--- Comment #8 from Nick Clemens (kidclamp) <n...@bywatersolutions.com> ---
The problem comes especially when other titles include the full title that is
being searched for.
This patch adds a second query sent to ES along with the user's original query.
The queries are sent as a 'bool' compound search, such that the original query
is a 'must' - so we will only return results that are in the initial query.
The query the patches add is a 'should' query. This simply serves as an
additional boost - so where the title field matches the terms entered exactly
we will boost that result to the top.
To test:
1 - Add a record with
245 $a novel
2 - Add a record with
245 $a A novel : $b about things / $c by me
3 - Search for: novel
4 - Search for: a novel
5 - Apply patch, restart all
6 - Repeat searches, note exact titles are boosted
It's not going to affect relevancy outside of exact title matches, though I
will follow up with another patch soon - I think we can apply the same logic to
other indexes - i.e. if I am searching for 'title' or 'kw' index - then add
'title-cover' but if I am searching 'subject' then add an field match for
'subject' so that "Underwater basket weaving" would match an exact subject over
a record with "Underwater sealife" "Basket fish" "Weaving fish" (I know, dumb
example)
As for the why of this:
Example from a partner catalog, searching for 'To Die For' - expecting the
David Baldacci book with exact title I get:
A diet to die for
Antiques to die for
U2, Rattle and Hum (track titles contain the three words)
Upstairs Downstairs
....many more results
To Die For by David Baldacci
I tried adding a boost of 128 (exponential above others) to title-cover - and
that can get titles up to 4 or 5 in the results lists, but before 'The Help' we
still get:
How to help the earth
Help for the haunted
Help! I'm a prisoner
You can also improve things by searching with quotes, or searching
'title-cover' directly, but none of this restores the ease of title searching
that users experienced in Zebra. For libraries that switch this is really seen
as a loss.
The time I have spent explaining to libraries why this isn't a problem would be
better spent adding the feature they want ;-)
I am happy to make this optional, but I do think it is a necessary feature
based on the amount of requests I have received.
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