Cognos 11 Search engine stopped working
Once you type in to search box and hit enter, it should give you all related results with that keyword. If it is not the case which as known issue on 11.0.10 version of Cognos, you need to do the following;
Stop the IBM Cognos services, and go to …64\cognos\analytics\data\search\indices and rename the folder “indices” to anything and then restart the IBM Cognos services. It will automatically re-create indices folder and search function should start to work as expected.
Hope this helps,