Enable ELB connection draining
Enable ELB connection draining

Enabling connection draining fixed error responses we get during
application deploys.

From the docs:

> You can enable connection draining if you want to keep existing
> load balancer connections open to unhealthy or deregistering
> instances to complete in-progress requests even as the load
> balancer stops sending new requests.

(http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.managing.elb.html#using-features.managing.elb.draining)

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