Solution : https://service.sap.com/sap/support/notes/592907 (SAP Service marketplace login required)
Key words : 
sap service marketplace alias patches sap kw -> sap kw 6, usee sap knowledge warehouse release 5, kw release> -> binary patches -> iks 5, deactivate lineiks_search_ranking = 100in file sapkwcfg, current patch levelthe iks version, sap knowledge warehouse release 5, sap knowledge warehouse system, sap knowledge provider reason, htm sap generally recommends, stop web site sap_kpro_webserver 2
Related Notes : 
       
| 612676 | IKS Patch 4: Session Copy | 
| 608369 | IKS Patches KW 5.2 / 6.0 | 
| 593722 | Knowledge Warehouse: Style template for Office 2000 | 
| 547817 | IKS: Logging | 
| 400874 | KW 5.1: Corrections for the IKS |