Bug 36578: Elasticsearch: publisher-location (pl) index should include field 752 (for old prints) and also support UNIMARC

Extension to bug 36269: 1) when cataloguing old prints, the standardized form of
the place of publication is given in the field 752 and as such should also be indexed.

2) Also, normal UNIMARC fields for publication place should be indexed (210a, 214a).

Test plan
=========

Scenario A (MARC 21, field 752)
-------------------------------
0. Have an installation with Elasticsearch and MARC 21 configuration.
1. Activate subfields 752 $a, $d in the default framework (Visibility: Editor).
2. Edit an existing record with this framework, putting some rare words in the
   752 $a and $d subfields.
3. Try to make a search with tis words (general keyword or by publication place,
   i.e. pl:).
4. You hsold get no results.
5. Apply the patch, reindex with:
   sudo koha-elasticsearch --rebuild -r -b kohadev
6. Repeat p. 3. You should get your edited record.

Scenario B (UNIMARC)
--------------------
0. Have an installation with Elasticsearch and UNIMARC configuration.
1. Try to search for a publication place, either with pl: directly in the
   search window, or in Advanced search, with Publisher location.
   With ktd UNIMARC test date you can search for 'Ste Geneviève Cedex'.
2. You should get no results.
3. Apply the patch, reindex with:
   sudo koha-elasticsearch --rebuild -r -b kohadev
4. Repeat p. 1. You should get some results (with ktd test data set and
   Ste Geneviève Cedex - record #1).

Signed-off-by: Roman Dolny <roman.dolny@jezuici.pl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

admin/searchengine/elasticsearch/mappings.yaml

@@ -3068,6 +3068,21 @@ biblios:
       marc_type: marc21
       sort: 1
       suggestible: ''
+    - facet: ''
+      marc_field: 752ad
+      marc_type: marc21
+      sort: 1
+      suggestible: ''
+    - facet: ''
+      marc_field: 210a
+      marc_type: unimarc
+      sort: 1
+      suggestible: ''
+    - facet: ''
+      marc_field: 214a
+      marc_type: unimarc
+      sort: 1
+      suggestible: ''
     opac: 1
     staff_client: 1
     type: ''