Fix oracle sql in article search index build.
Fix oracle sql in article search index build.

xhoy/otrs,rudy500/otrs,rudy500/otrs,mburggraf/otrs,xhoy/otrs,mburggraf/otrs,mburggraf/otrs,mburggraf/otrs,rudy500/otrs,rudy500/otrs,xhoy/otrs,xhoy/otrs,rudy500/otrs,mburggraf/otrs,xhoy/otrs