Thank you for your answer, i added :
$contents = preg_replace('/<[a-zA-Z\/][^>]*>/', ' ', $contents);
before
$contents = strip_tags($contents);
and now i got an indexation that looks pretty good !
I could add :
$pcoms = preg_replace('/<[a-zA-Z\/][^>]*>/', ' ', $pcoms);
between :
$pcoms = relevanssi_strip_invisibles($pcoms);
and
$pcoms = strip_tags($pcoms);
$pcoms = relevanssi_tokenize($pcoms);
to modify comments indexation ..
Is it possible to add a fix in a next version ?
Thank you again !