static RoutableFactory createDocumentIgnoredReplyFactory() {
        return ProtobufCodecBuilder
                .of(DocumentIgnoredReply.class, DocapiCommon.DocumentIgnoredResponse.class)
                .encoder((apiReply) -> DocapiCommon.DocumentIgnoredResponse.newBuilder().build())
                .decoder(DocapiCommon.DocumentIgnoredResponse.parser(),
                        (protoReply) -> new DocumentIgnoredReply())
                .build();
    }
Implementation of MessageBus message request/response serialization built around Protocol Buffers.
documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/RoutableFactories80.java