Elastic API check fix

[Zenidd]

Hi team,

The current Elasticsearch API test after opendistro install fails on clusters with yellow status. This PR sets yellow status as a valid one for task success.

Greetings,

JP

[xr09]

LGTM!

[neonmei]

Luce bien 👍

[neonmei]

A little extra detail is that these and in the until clause can be used as an array (ansible >2.8.something), like so:

      until:
        - _result.json is defined
        - _result.json.status == "green" or  _result.json.status == "yellow" and single_node

and the block clause that starts on line 8 needs a extra level of identation (2 spaces)

[Zenidd]

Just replaced the until statement syntax with your suggestion @neonmei. I added parenthesis in the conditional checking the cluster status to ensure legibility. Fixed on af948df