After enabling the elasticsearch debian/ubuntu
images the container doesn't starts with ELK 5.4.1
as ES_HEAP_SIZE has been deprecated.
We should use ES_JAVA_OPTS with the -Xms/Xmx options instead.
Closes-Bug: #1772482
Change-Id: I9b368468d41421d679a9c4ad6fdf595863de7a1a
Signed-off-by: Jorge Niedbalski <jorge.niedbalski@linaro.org>