Using splunk enterprise for this specific case breaks the chicken->egg cycle, if you can get it to work with a trial splunk enterprise(you have more control over what you want to do), then you can go and use splunk cloud (cause it should work there too). Most of the things that work with splunk enterprise will work with cloud too.
I was asking to do this to know if HTTP Event Collector has been configured correctly. Seems like it is cause you can make curl requests and they get indexed.
I am going to dig on this more on docker side, i tried with docker version 1.12.1, I think since its a minor version change from what you ran, the issue might be something else. I will comeback once I have an answer.
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