Solr 9.2.1 : Change caseSensitive to caseInsensitive on a field

[L'HARHANT Mikael]

Hello,

I have, in the schema.xml, a field like this.

<field name="XXXXXXX" type="string" indexed="true" stored="false"  
docValues="true" required="false" />

And I want to change to something like :

<field name="XXXXXX" type="case_insensitive" indexed="true" stored="true" 
required="false" />

May I need to launch a reload of all the documents or is it possible to add an 
element in the < schema.xml > or via an backup / restore ?

Thanks.