Simon Willnauer 84ce9f3618 Remove the ability to fsync on every operation and only schedule fsync task if really needed
This commit limits the `index.translog.sync_interval` to a value not less than `100ms` and
removes the support for fsync on every operation which used to be enabled if `index.translog.sync_interval` was set to `0s`
Now this pr also only schedules an async fsync if the durability is set to `async`. By default not async task is scheduled.

Closes #16152
2016-01-27 12:28:38 +01:00
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