macOS Disable xcode 5 index

[abcdefg12345]

when i work on my project Xcode is indexing 90 percent of the time and it slows my macbook pro a lot i tried this command in terminal and restarted Xcode but it didn't stop indexing

defaults write com.apple.dt.XCode IDEIndexDisable 1

what am i doing wrong

 

[xStep]

Usually indexing gets done quickly enough and it isn't a big deal. Other times I've quit Xcode and restarted because it just pigs out on indexing. I definitely wouldn't disable Xcode indexing as it it is intended to make the overall working experience better.