[Koha-bugs] [Bug 33594] New: Sorting results by Title A-Z might use wrong title field

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=33594

            Bug ID: 33594
           Summary: Sorting results by Title A-Z might use wrong title
                    field
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Searching - Elasticsearch
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: katrin.fischer at bsz-bw.de
                CC: januszop at gmail.com, nick at bywatersolutions.com
        Depends on: 33206

When sorting by title we expect the sorting to use 245, but this is not always
the case. title in Elasticsearch is a broadly defined index, also containing
other title fields.

Example:
* Search for 'e' with Elasticsearch in the sample data
* Result will look something like this:

14. Agesilaos and the crisis of Sparta Paul Cartledge 

15. Xenophōntos Agēsilaos. Agesilaus of Xenophon / the text revised, with
critical and explanatory notes, introduction, analyses and indices, by H.
Hailstone. 

16. Alcestis / Euripides ; edited with introduction and commentary by A.M.
Dale. 

So what happened here? Look at the MARC of 15. - 240 was used:

240     1       0       _a Agesilaus.
_l Greek.
_f 1879
245     1       0       _a Xenophōntos Agēsilaos. Agesilaus of Xenophon /
_c the text revised, with critical and explanatory notes, introduction,
analyses and indices, by H. Hailstone.


Maybe we need a specific index definition for sorting?


Referenced Bugs:

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=33206
[Bug 33206] Bad title__sort made of multisubfield 245
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