Add elasticsearch 5 storage compatibility

[mRoca]

Hello,

This PR is a replacement proposal for #1597 without adding a new storage driver, without the new options added by @oopschen for now (I can add them if we choose to implement this way).

The main problem, here, is the usage of 2 libraries for the same storage engine: the most recent one (elastic.v5) and the legacy one (elastic.v2) for the backward compatibility.

This PR (or the other one) fixes #1753 and #1517 .

WDYT about it ?

[k8s-ci-robot]

Hi @mRoca. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[xiangpengzhao]

/ok-to-test

note: this command is a test of kubernetes/test-infra#5793

[bobbypage]

This PR is very out of date and abandoned as well as we don't want to add new storage drivers, see #1458 (comment)

As a result, closing this PR for now.