https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=38694

Matthias Meusburger <[email protected]> changed:

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--- Comment #27 from Matthias Meusburger <[email protected]> ---
Created attachment 180057
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=180057&action=edit
Bug 38694: Add ESBoostFieldMatch option to Elasticsearch

What this patch does is:
1 - Wraps the existing search code in a a "bool" compound query as a "must".
This should not affect
    relevancy or results of the existing searches.
2 - Before we clean/truncate terms, loop through the passed in search terms and
indexes to build a
    new 'should' query, using the 'match' on the specified index/field that is
added to the 'bool' query from above.
    This means that if a result from the original query is also returned here,
that item will be boosted in the result.
    For searches on 'keyword' or 'title', or if no index is set, we use
'title-cover' as the most narrow form of title

This query isn't going to help when users enter CCL (i.e. ti:To die for) and it
won't boost titles from 505, series, etc
when doing a general search. Nor will it have a detrimental effect, it will
only boost field matches

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
    - Above records are returned lower in the list (results #6 and #14 for me)
4 - Search for: a novel
    - Above records are returned lower in the list (results #6 and #14 for me)
5 - Apply patch, restart all, enable ESBoostFieldMatch option
6 - Repeat searches, note exact titles are boosted
    - For 'novel' record from #1 is #1 result and other is second
    - For 'a novel' record form #2 is #1 result and other is third
7 - Disable the new pref and repeat steps 3 and 4 and get results as before
patch
8 - Experiment with other searches, turning pref on and off to verify relevant
titles are boosted when enabled
9 - Search results when disabled should return as before the patch

Signed-off-by: Matthias Meusburger <[email protected]>

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