Specification of GetRequest/FlushRequest does not mention "network_instance all" option

[LimeHat]

In the specification.md both GetRequest message (section 4.2.1) and FlushRequest message (section 4.3.1) explicitly mention that network-instance name has to be specified; however, in proto files, we can see that network_instance is defined as oneof name/all:

  oneof network_instance {
    // The network instance from which the entries should be retrieved.
    // If `network_instance` is nil (`name` and `all` not specified),
    // or if `name` is specified and it is the empty string "",
    // then the request is considered invalid and the server should
    // respond with the INVALID_ARGUMENT error code in the status.proto
    // carried along with the RPC response.
    string name = 1;
    // all indicates that entries for all network instances for the
    // should be returned.
    Empty all = 2;
  }

Could you please clarify what is the expected behavior going forward, i.e. should the spec be updated to support "all" flag, or "all" is going to be eventually deprecated?

Thanks,