ES gateway timeout

I have upgraded elasticseach from 1.7.3 to 2.0.0. I restarted elasticsearch ,I stuck up with gateway. My curl command not working. Can u help me out with this. Here is my ES snippet.

Hi please share the migaration check and steps which have been followed to upgrade

Just follwed the steps from below link:

have you shutdown the old ES nodes before starting the New Nodes

have you shutdown the old version nodes before starting the new version nodes

yes I have done

Did you release the 2.0 release notes?

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