Bug 31695: Type standard number is missing field ci_raw in field_config.yaml

In Elasticsearch fields config field_config.yaml, default type as a field 'ci_raw'. This is used for exact search.
This field is missing for type  standard number 'stdno'.

Test plan :
1) In the staff interface, go to Administration, and search for SearchEngine
2) Make sure that the SearchEngine preference is set to Elasticsearch and save
3) Return to Administration and select "Search engine configuration"
4) Change the type of "Heading-Main" to "Std. Number" and save
5) Rebuild the index (e.g. "koha-elasticsearch --rebuild -d kohadev")
6) Go to the main staff page and select Authorities
7) Search for a heading (e.g. "A Dual-language book")
=> Result is found with or without patch
8) Click on the sliders and select "is exactly" for the operator and search
=> Result is found only with patch
9) Apply the patch
10) Rebuild the index (e.g. "koha-elasticsearch --rebuild -d kohadev")
11) Click on the sliders and select "is exactly" for the operator and search
=> Result is found only with patch

Signed-off-by: Kevin Carnes <kevin.carnes@ub.lu.se>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 106adb320c)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
(cherry picked from commit 085a11b3dd)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit e62ca63b1d)
Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>

admin/searchengine/elasticsearch/field_config.yaml

@@ -38,6 +38,9 @@ search:
         search_analyzer: analyzer_phrase
       raw:
         type: keyword
+      ci_raw:
+        type: keyword
+        normalizer: icu_folding_normalizer
   default:
     type: text
     analyzer: analyzer_standard