Update Elasticsearch plugin to v4.0.3
Update Elasticsearch plugin to v4.0.3

Because the previous ES plugin versions contain non-preserving scheme
issue.
elasticsearch-ruby treats scheme information without option.http.scheme
as ephemeral information.
So, https scheme users suffered suddenly fallback to http issue.
Elasticsearch plugin v4.0.3 fixes this issue.

See: https://github.com/uken/fluent-plugin-elasticsearch/pull/713
Signed-off-by: Hiroshi Hatake <a476a6e5b5893650242fbf0b2961500a9bd9032e@clear-code.com>

fluent/fluentd-kubernetes-daemonset,fluent/fluentd-kubernetes-daemonset,fluent/fluentd-kubernetes-daemonset