Upgrade elasticsearch 6.4.3

Unable to cherry-pick, so making a new review. And
need to upgrade the version.

This upgrade fixes a few security issues as described in the JIRA.

Issue-ID: POLICY-1538
Change-Id: I467acbb1dce1a922b13a521e9dd40477c012b409
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
25 files changed