rpc Put (PutRequest) returns (PutResponse) { }

message PutRequest {
    bytes key = 1;
    bytes value = 2;

    // Lease identifier or 0 for no lease
    int64 lease = 3;

    // Optionally return previous key value pair
    bool prev_kv = 4;

    // Optionally update using existing value
    bool ignore_value = 5;

    // Optionally update using existing lease
    bool ignore_lease = 6;
}

message PutResponse {
    ResponseHeader header = 1;
    KeyValue prev_kv = 2;
}