Bug 36574: Canceled/invalid ISBN not indexed by ES for MARC 21

For MARC 21, canceled/invalid ISBNs (subfield 020 $z) are not being
indexed in Elasticsearch (search fields identifier-standard and isbn),
but it is for UNIMARC (subfield 010 $z).  As a result, a user searching
for such an ISBN (e.g. with wrong checksum--and therefor put in 020 $z)
will not find the record in the catalogue.

A new isbn-all Elasticsearch search field 'isbn-all' has been created with
020az (MARC 21, and 010az for UNIMARC), 010z has been removed from isbn
search field for UNIMARC, and 020z has been added to identifier-standard
search field.

Test plan
=========
0. Have a test installation with Elasticsearch.
1. In ktd with its test data, make a biblio search for a cancelled ISBN
   e.g. 9780007269854.  You will get no results.
2. Apply the patch, reindex with:
   sudo koha-elasticsearch --rebuild -r -b kohadev
3. Repeat the test. You should get "The ice princess / Camilla Läckberg".

Signed-off-by: Roman Dolny <roman.dolny@jezuici.pl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 915d585b50)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit f382f4a271)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

admin/searchengine/elasticsearch/mappings.yaml

@@ -1974,7 +1974,7 @@ biblios:
       sort: 1
       suggestible: ''
     - facet: ''
-      marc_field: 020a
+      marc_field: 020az
       marc_type: marc21
       sort: 1
       suggestible: ''
@@ -2065,6 +2065,23 @@ biblios:
       marc_type: marc21
       sort: 1
       suggestible: ''
+    - facet: ''
+      marc_field: 010a
+      marc_type: unimarc
+      sort: 1
+      suggestible: ''
+    opac: 1
+    staff_client: 1
+    type: isbn
+  isbn-all:
+    label: isbn-all
+    mandatory: ~
+    mappings:
+    - facet: ''
+      marc_field: 020az
+      marc_type: marc21
+      sort: 1
+      suggestible: ''
     - facet: ''
       marc_field: 010az
       marc_type: unimarc