https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=36852

Olli-Antti Kivilahti <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |olli-antti.kivilahti@hypern
                   |                            |ova.fi

--- Comment #6 from Olli-Antti Kivilahti <[email protected]> ---
Hi!
We have a client who has a similar-but-opposite problem regarding subject
searching.
When looking for a specific "subject as phrase", Koha returns also more general
subjects.

eg.

su,phr:"Europe"

returns: "Europe", "European brotherhood", "European ancestry"

If we were to add 610$b "European Regional Conference" to subject-index,
su,phr:"Europe" would also return the record with a mention of the conference.
Which might not be desirable.

My point:
- Presently, if this change is accepted, it would exaggerate our client's
search challenge.
- The change is good, when the way the subject-index phrase search is tokenized
in the ES search index, is changed:
-- "subject as phrase"-search needs to use it's own search index,
   'subject-phrase'.
-- 'subject-phrase' needs to follow its own rules of search term tokenization.
   This is achieved using a Elastic field-specific analyzer.
--- It must preserve the way the words are written exactly within a subfield.
    So tokenize the complete subject word/words as a single indexed search
    token.
    eg. 610$a "International Labour Organisation" is tokenized to index as
    "International Labour Organisation"
    instead of the current way:
    "International", "Labour", "Organisation"
--- Rewire the advancedsearch to use the new 'subject-phrase'-index

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