Cherry-pick to 7.x: [ITs] change healthcheck for elasticsearch (#20514)(#20558)#20538

Merged

v1v merged 2 commits intoelastic:7.xfrom v1v:backport/7.x/pr-20514

Aug 12, 2020

+5-6

Commits on Aug 11, 2020

[ITs] change healthcheck for elasticsearch (elastic#20514 )
v1v
committed

Commits on Aug 12, 2020

[ITs] Revert healthcheck for elasticsearchssl service to the previous behaviour (elastic#20558 )
v1v
committed