unindexed searches at 11.1.1.5.0 running on Linux NUMA (Non-Uniform Memory Architecture) operating system

if you have 11.1.1.5.0 and see some searches are unindexed and you are running 11g at Linux(latest version), it is bug that is fixed after upgrading to 11.1.1.5.1

issue is 11.1.1.5.0 doest support  NUMA (Non-Uniform Memory Architecture) base operating system, so you  have to upgrade it to 11.1.5.1 in order to fix this issue. also 11.1.1.5.1 fix a lot of performance issues.