Need "truncate table" / "truncate bucket" equivalent for Couchbase

Customers are using Couchbase for nightly processing of data. These records need to be periodically cleaned up on a nightly basis.

Using delete from bucket is non sustainable for 2 million records and query, max parallelism tests we have been able to get 25 minutes down to 6-7 minutes (but thats a function of the object size, index etc.)

This will not work for 20 million documents.

Customers also want to use FLUSH but that is an ADMIN only REST API functionality.

We need to support "truncate bucket" to be able to cater to these usecases.

Indexing today currently does handle "Reset to Zero" on flush and does not require the DCP mutations to be streamed. 

We need Query and RBAC support for this.

Keshav Murthy [~don]