variabilize path.data and path.log in elasticsearch.yml

[wdesmarescaux]

Hello all,
Thanks for your ansible module, it's very clear
Could you variabilize path.data and path.log in elasticsearch.yml jinja template ?

Thanks in advance

[nicenemo]

This can be done by #74

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[pierrejego]

This one will do the same job #95 Thanks @chadek