Support deferring index write[async index update/ eventual data-index consistency]

[wey-gu]

Is your feature request related to a problem? Please describe.
Is it possible to support an argument in the write query to optionally bypass the index update? Thus it's possible to have better write performance and make the index update deferred?

Describe the solution you'd like
Optionally improve write performance when the index is a must while index-based lookup query can tolerant this consistency-loss. (AP over CP on data-index consistency).

The deferred index rebuild could be triggered manually or periodically in the background.

Describe alternatives you've considered
Maybe not an option per request(if it's leading mess with mixed requests for both sync/async index-update), but to introduce an option adopted globally?

Additional context
Not sure if it's reasonable or even silly, just thinking that if the user could tolerant this inconsistency before it's eventually updated periodically in batch background jobs(or planned in cold time).