1- edit the file
/etc/koha/zebradb/marc_defs/marc21/biblios/biblio-koha-indexdefs.xml
remove theses lines
<index_data_field tag=”245″>
<target_index>Title:w</target_index>
<target_index>Title:p</target_index>
</index_data_field>
2- run this command
xsltproc /etc/koha/zebradb/xsl/koha-indexdefs-to-zebra.xsl /etc/koha/zebradb/marc_defs/marc21/biblios/biblio-koha-indexdefs.xml > /etc/koha/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl
3- rebuild zebra
sudo koha-rebuild-zebra -b -f -v <yourInstance>
Ahmad Maher 