add new fields from to in schema

solr/gfl/conf/schema.xml

@@ -115,12 +115,18 @@
   <field name="origin_place" type="text_de" multiValued="true" />
   <field name="destination_place" type="text_de" multiValued="true" />
   <field name="origin_date" type="date" />
+  <field name="from" type="date" />
+  <field name="to" type="date" />
   <field name="source_description" type="text_de" multiValued="true" />
   <field name="gnd_keyword" type="text_de" multiValued="true" />
   <field name="free_keyword" type="text_de" multiValued="true" />
   <field name="note_comment" type="text_de" multiValued="true" />
   <field name="image_id" type="string" multiValued="true"/>
   
+  <field name="keywords" type="text_de" multiValued="true" />
+  <copyField source="gnd_keyword" dest="keywords" />
+  <copyField source="free_keyword" dest="keywords" />
+  
   <field name="type_refs" type="string" multiValued="true"/>
   <field name="target" type="string" multiValued="true"/>
   <field name="ref_refs" type="string" multiValued="true"/>
@@ -164,6 +170,7 @@
   <copyField source="title" dest="title_sort" />
   <field name="short_title_sort" type="string" />
   <copyField source="short_title" dest="short_title_sort" />
+  
   <!-- Some dates are only years without month and day, so Solr doesn't want to sort the actual 'date' field -->
   <field name="origin_date_sort" type="string" />
   <copyField source="origin_date" dest="origin_date_sort" />