Change default store_type to fs

[ebadyano]

Closes #79

[ebadyano]

@dliappis One concern I have is that @danielmitterdorfer very recently delivered a chance in f1e4143 where he used hybridfs as a default and not fs; wonder if I'm missing something for #79. Also I ran nested with the default changes to fs, seems to work fine. Any ideas?

[dliappis]

where he used hybridfs as a default and not fs

As per https://www.elastic.co/guide/en/elasticsearch/reference/current/index-modules-store.html#file-system:

fs
Default file system implementation. This will pick the best implementation depending on the operating environment, which is currently hybridfs on all supported systems but is subject to change.

So currently (as of ES 7.0, please do double check the versions in the docs) fs equals hybridfs so we are ok.

I'd be careful about backporting this PR though to older branches esp. since fs became available after 7.0.

[dliappis]

LGTM

[danielmitterdorfer]

I'd be careful about backporting this PR though to older branches esp. since fs became available after 7.0.

@ebadyano, @dliappis I think it is safe to backport this all the way until 5 as fs is available there as well? However, he store_type track parameter is currently available in 7, 7.2, 7.1 and 7.0 and I think we should backport this PR at least to these branches as well.

[dliappis]

Thanks @danielmitterdorfer 👍 on backporting to 7, 7.2, 7.1 and 7.0.

[ebadyano]

Backported to 7, 7.1, 7.0. I don't see 7.2 branch under rally-tracks..

[danielmitterdorfer]

I don't see 7.2 branch under rally-tracks..

You're right. Thanks for backporting it!