SearchIndexer.exe (Microsofts Windows Search Indexer) in Windows 7 is the powerful windows search, but sometimes it uses a amount of CPU Usage and may utilizes near 100% CPU usage. Looking at the Resource Monitor the process 'Searchindexer.exe' is getting High CPU. So you need to disable or Delete SearchIndexer.exe to stop Windows Enhanced Search.
How to disable searchindexer.exe in windows 7.
* Click Start Button --> Control Panel --> Programs and Features --> Turn Windows Features on or off.
* Clear the Indexing Service's chek box on the "Windows Features" window and click ok.
Now you turn off Windows Search's Index service and Windows 7 still has its simple search functionality.