feat(solr-schema): Add multi-valued creator field with subfields for …

…improved indexing

- Added `creator` as a multi-valued field to support multiple creators per dataset.
- Introduced `creator_name` and `creator_identifier` subfields to store detailed creator information.
- Updated schema to align `creator` field structure with existing `contact_point` field approach.
- Ensured `creator_name` and `creator_identifier` fields are indexed and stored correctly for accurate search and retrieval.

solr/schema.xml

@@ -160,10 +160,18 @@ attribute with the form `ckan-X.Y` -->
         <field name="provenance" type="string" indexed="true" stored="true" multiValued="false" />
         <field name="spatial_uri" type="string" indexed="true" stored="true" multiValued="false" />
         <field name="contact_uri" type="string" indexed="true" stored="true" multiValued="false" />
+        <field name="contact_name" type="text_general" indexed="true" stored="true" />
         <field name="contact_point" type="string" indexed="true" stored="true" multiValued="true" />
+        <field name="creator" type="string" indexed="true" stored="true" multiValued="true" />
+        <field name="creator_name" type="text_general" indexed="true" stored="true" />
+        <field name="creator_identifier" type="string" indexed="true" stored="true" />
         <field name="resources_formats" type="string" indexed="true" stored="true"
             multiValued="true" />
         <field name="publisher_name" type="string" indexed="true" stored="true" multiValued="false" />
+        <field name="publisher_uri" type="string" indexed="true" stored="true" />
+        <field name="publisher_email" type="text_general" indexed="true" stored="true" />
+        <field name="publisher_url" type="string" indexed="true" stored="true" />
+        <field name="publisher_type" type="string" indexed="true" stored="true" />
 
         <field name="capacity" type="string" indexed="true" stored="true" multiValued="false" />
         <field name="permission_labels" type="string" indexed="true" stored="false"
@@ -242,5 +250,7 @@ attribute with the form `ckan-X.Y` -->
     <copyField source="res_description" dest="text" />
     <copyField source="maintainer" dest="text" />
     <copyField source="author" dest="text" />
-
+    <copyField source="creator_name" dest="text" />
+    <copyField source="contact_name" dest="text" />
+    <copyField source="publisher_name" dest="text" />
 </schema>