[Remote Store] Reallow index & cluster default Refresh Interval to be set as -1.

[astute-decipher]

Is your feature request related to a problem? Please describe

After the launch of remote store, We discontinued to allow customer to set Refresh interval = -1, as it can lead to large number of uncommitted Translog files. We want to start allowing it while controlling the number of uncommitted Translog files explicilty.

Describe the solution you'd like

We will introduce a new index setting which will limit the concurrent number of Translog files, once it's breached we will refresh the index.

Related component

Storage:Remote

Describe alternatives you've considered

No response

Additional context

No response

[peternied]

[Triage - attendees 1 2 3 4 5 6 7 8]
@astute-decipher Thanks for filing, we'd look forward to a pull request to address this issue.