Remove dependance on index mots_notices
Actually search engine rely on two indexexes:
FULLTEXT KEY mots_notice
(titres
,auteurs
,editeur
,collection
,matieres
,dewey
)
FULLTEXT KEY mots_notice_2
(titres
,auteurs
,editeur
,collection
,matieres
,dewey
,other_terms
)
This commit ensure only the last one is used so the first one can be deleted later. This produce a 2x speedup on insert / delete / update requests