Upgrade elasticsearch to 6.4.1

Recommendation is to upgrade to clear security vulnerability
as described in the JIRA.

Issue-ID: POLICY-1538
Change-Id: If6a55ffcf4babb7547e52a7971061e9c9a197c43
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
1 file changed