[Remote Store] All remote indices will have both translog and segment backed remote store.

[linuxpi]

Is your feature request related to a problem? Please describe.
Today remote index creation provides 2 options, either the index can just have remote backed segment store or index can have both remote based segment and translog store. Since only the later provides full durability guarentees, its confusing to an end user looking at these options.

Describe the solution you'd like
To simplify user experience, we would remove the option to configure just remote backed segment store and by default both translog and segment store would be remote backed whenever a remote backed index is created.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.