--- solr-9.3.0/server/solr/configsets/_default/conf/solrconfig.xml	2023-07-17 17:13:55
+++ conf/solr/9.3.0/solrconfig.xml	2023-08-24 06:38:03
@@ -714,6 +714,56 @@
     <lst name="defaults">
       <str name="echoParams">explicit</str>
       <int name="rows">10</int>
+      <!--
+        This boosting configuration has been
+        - first introduced in 2015, see https://github.com/IQSS/dataverse/issues/1928#issuecomment-91651853,
+        - been re-introduced in 2018 for Solr 7.2.1 update, see https://github.com/IQSS/dataverse/issues/4158,
+        - and finally evolved to the current state later in 2018 https://github.com/IQSS/dataverse/issues/4938
+          (merged with https://github.com/IQSS/dataverse/commit/3843e5366845d55c327cdb252dd9b4e4125b9b88)
+                
+        Since then, this has not been touched again (2021-12-21).
+      -->
+      <str name="defType">edismax</str>
+      <float name="tie">0.075</float>
+      <str name="qf">
+          dvName^400
+          authorName^180
+          dvSubject^190
+          dvDescription^180
+          dvAffiliation^170
+          title^130
+          subject^120
+          keyword^110
+          topicClassValue^100
+          dsDescriptionValue^90
+          authorAffiliation^80
+          publicationCitation^60
+          producerName^50
+          fileName^30
+          fileDescription^30
+          variableLabel^20
+          variableName^10
+          _text_^1.0
+      </str>
+      <str name="pf">
+          dvName^200
+          authorName^100
+          dvSubject^100
+          dvDescription^100
+          dvAffiliation^100
+          title^75
+          subject^75
+          keyword^75
+          topicClassValue^75
+          dsDescriptionValue^75
+          authorAffiliation^75
+          publicationCitation^75
+          producerName^75
+      </str>
+      <!-- Even though this number is huge it only seems to apply a boost of ~1.5x to final result -MAD 4.9.3 -->
+      <str name="bq">
+          isHarvested:false^25000
+      </str>
     </lst>
   </requestHandler>
 
@@ -798,12 +848,15 @@
        See https://solr.apache.org/guide/solr/latest/query-guide/spell-checking.html for details
        on the request parameters.
     -->
+  <!--
   <requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
     <lst name="defaults">
+    -->
       <!-- Solr will use suggestions from both the 'default' spellchecker
            and from the 'wordbreak' spellchecker and combine them.
            collations (re-written queries) can include a combination of
            corrections from both spellcheckers -->
+  <!--
       <str name="spellcheck.dictionary">default</str>
       <str name="spellcheck">on</str>
       <str name="spellcheck.extendedResults">true</str>
@@ -819,6 +872,7 @@
       <str>spellcheck</str>
     </arr>
   </requestHandler>
+  -->
 
   <!-- Highlighting Component
 
@@ -951,6 +1005,7 @@
        See https://solr.apache.org/guide/solr/latest/indexing-guide/schemaless-mode.html for further explanation.
 
     -->
+  <schemaFactory class="ClassicIndexSchemaFactory"/>
   <updateProcessor class="solr.UUIDUpdateProcessorFactory" name="uuid"/>
   <updateProcessor class="solr.RemoveBlankFieldUpdateProcessorFactory" name="remove-blank"/>
   <updateProcessor class="solr.FieldNameMutatingUpdateProcessorFactory" name="field-name-mutating">
@@ -1002,7 +1057,7 @@
   </updateProcessor>
 
   <!-- The update.autoCreateFields property can be turned to false to disable schemaless mode -->
-  <updateRequestProcessorChain name="add-unknown-fields-to-the-schema" default="${update.autoCreateFields:true}"
+  <updateRequestProcessorChain name="add-unknown-fields-to-the-schema" default="${update.autoCreateFields:false}"
            processor="uuid,remove-blank,field-name-mutating,parse-boolean,parse-long,parse-double,parse-date,add-schema-fields">
     <processor class="solr.LogUpdateProcessorFactory"/>
     <processor class="solr.DistributedUpdateProcessorFactory"/>