Bug 36269: Elasticsearch: publisher-location (pl) should use260a/264a

Bug 36269: Elasticsearch: publisher-location (pl) should use260a/264a

Currently the index `pl` points to 008/15-17. It should
(additionally/instead?) point to 260a and/or 264a.

Test plan (for koha-testing-docker with ElasticSearch via `ktd --es7 up`)

Verify the old/broken behaviour:

* Go to Staff/Advanced Search
* Select "Publisher Location" and enter "cau", start search
* You will get some hits (~16), eg "Perl best practices / Damian Conway", which has 008 of "051222s2005 caua b 001 0 eng d" with "cau" on 15-17
* Edit this record (cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=5)
* Inspect 260$a, which should containt "Sebastopol, CA :"
* Go back to Advanced Search and search for  "Publisher Location" = "Sebastopol"
* No hits!

Apply the patch!

* exit ktd and stop it (ktd --es7 down; ktd --es7 stop)
* start it again
* Go to Staff / Administration / Search Engine Config (Elasticsearch)
* Click on the Tab "Bibliographic records" and search/filter for "pl"
* you should see 3 entries for "pl", with Mapping values of "008_/15-17", "260a" and "264a"
* Go to Search,
* Select "Publisher Location" and enter "cau", start search
* same hits as befor
* Search again, but for "Sebastopol"
* Now you'll get 9 hits!!

Bonus: Test 264a

* Got to Admin / MARC bibl framework, select BKS -> MARC structure
* search for tag "264", edit subfields
* in tabs a, b, c: Check the "Editor" Checkbox (Visibility)
* Save changes
* find a book, eg again "Perl best practices" and edit it
* find field 264 and enter "Test" into  264a, Save
* Depending on your setup, you might have to manually re-index the book:
  * enter ktd: ktd --shell
  * reindex the one book (via --bn) or all (might also need a -d)
    /usr/share/koha/bin/search_tools/rebuild_elasticsearch.pl -v -b -d
* Go again to Advanced Search, Publisher Location = "Test"
* You should find the book

If your NOT running ktd, you might be able to just edit the ElasticSearch Mappings to add / change the mapping for "pl" to point to "260a".

One rather harsh way to do this (which I needed to do, because the ES Mappings UI did not work for me) is via this SQL:
update search_marc_map set marc_field='260a' where marc_field='008_/15-17';

Sponsored-by: Steiermärkische Landesbibliothek
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit df9bc0b86a83d60b7b71924c46087bed7aa4226b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>