Configurable timeDefaults, preferably per dashboard

[elssar]

There doesn't seem to be any way to configure the default time filter in Kibana 4. To change the default, I either need to edit src/kibana/services/timefilter.js and build kibana, or edit the timeDefaults object defined in lines 115487+ of /src/public/index.js of an installed instance of kibana. Neither option is particularly great.

Ideally, we should be able to configure the time defaults from the advanced settings page. However, this is a global value. We have multiple dashboards, and they work better at different time resolutions. Would be nice to be able to save the time filters for each dashboard, like we could in Kibana 3.

[rashidkpc]

Duplicate of #2874.

Saving a default time for a dashboard is already implemented in master: #3164