Search: By default, don't return the version per hit, unless `version` is set to `true`

[kimchy]

By default, don't return the version for each search hit, but, instead, allow to either pass a url level parameter called version and set it it to true, or pass in the search request body "version" : true" (on the same level as explain).

[kimchy]

Search: By default, don't return the version per hit, unless version is set to true, closed by ac8646d.