XWIKI-11897: Search not working through documents in Czech language

undo the type name change and add a comment

xwiki-platform-core/xwiki-platform-search/xwiki-platform-search-solr/xwiki-platform-search-solr-server/xwiki-platform-search-solr-server-data/src/main/resources/xwiki/conf/schema.xml

@@ -242,7 +242,9 @@
    <dynamicField name="*_ar"  type="text_ar"    indexed="true"  stored="true" multiValued="true" />
    <dynamicField name="*_bg"  type="text_bg"    indexed="true"  stored="true" multiValued="true" />
    <dynamicField name="*_ca"  type="text_ca"    indexed="true"  stored="true" multiValued="true" />
-   <dynamicField name="*_cs"  type="text_cs"    indexed="true"  stored="true" multiValued="true" />
+   <!-- cs for XWiki means cz for Solr. 
+        See https://issues.apache.org/jira/browse/LUCENE-6366 and https://issues.apache.org/jira/browse/SOLR-7267 -->
+   <dynamicField name="*_cs"  type="text_cz"    indexed="true"  stored="true" multiValued="true" />
    <dynamicField name="*_da"  type="text_da"    indexed="true"  stored="true" multiValued="true" />
    <dynamicField name="*_de"  type="text_de"    indexed="true"  stored="true" multiValued="true" />
    <dynamicField name="*_en"  type="text_en"    indexed="true"  stored="true" multiValued="true" />
@@ -840,7 +842,7 @@
     </fieldType>
 
     <!-- Czech -->
-    <fieldType name="text_cs" class="solr.TextField" positionIncrementGap="100">
+    <fieldType name="text_cz" class="solr.TextField" positionIncrementGap="100">
       <analyzer> 
         <tokenizer class="solr.StandardTokenizerFactory"/>
         <filter class="solr.LowerCaseFilterFactory"/>