private static DocapiCommon.FieldSet toProtoFieldSet(String rawFieldSpec) {
        return DocapiCommon.FieldSet.newBuilder().setSpec(rawFieldSpec).build();
    }
Implementation of MessageBus message request/response serialization built around Protocol Buffers.
documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/RoutableFactories80.java