This seems to be closely related to your issue:
https://www.elastic.co/blog/hot-warm-architecture?blade=tw

Am Mittwoch, 16. September 2015 17:12:45 UTC+2 schrieb 
holgerop...@gmail.com:
>
> *Is it possible to move older indices from FS x on SSD to FS y on HDD?*
>
> We want to try this because server with large SSD-arrays are aweful 
> expensive. We know we have to expect performance implications during 
> searches in data we moved to HDD.
> As far as we know old indices are no longer updated in any way.
>
> Can we:
>
>    1. close the index in Graylog
>    2. move the shards-directory of an old index from FS x to FS y.
>    ES config must include the multiple data locations option.
>    3. reopen the index in Graylog.
>
> What do you think?
>
>

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