Fixed typo of *configuration*

[wasserman]

The docs had congiguration instead of configuration.

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[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[dakrone]

Hi, thanks for the submission!

Could I ask you to sign the CLA so we can merge this in?

[wasserman]

Signed. I apologize for the delay, but it took time to get this approved by my company.

[cbuescher]

@wasserman thanks for signing the CLA, I merged this to master and the active branches.