Refactor `AbstractSimpleTransportTestCase` and `MockTransportService` to not use `Version.transportVersion` 
test/framework/src/main/java/org/elasticsearch/transport/AbstractSimpleTransportTestCase.java
}
        }
    }
    public void testVersionFrom0to1() throws Exception {
        serviceB.registerRequestHandler("internal:version", ThreadPool.Names.SAME, Version1Request::new, (request, channel, task) -> {
            assertThat(request.value1, equalTo(1));
            assertThat(request.value2, equalTo(0)); 
            Version1Response response = new Version1Response(1, 2);
            channel.sendResponse(response);
            assertEquals(version0.transportVersion, channel.getVersion());
        });
        Version0Request version0Request = new Version0Request();
        version0Request.value1 = 1;
        Version0Response version0Response = submitRequest(
            serviceA,
            nodeB,
            "internal:version",
            version0Request,
            new TransportResponseHandler<Version0Response>() {
                @Override
                public Version0Response read(StreamInput in) throws IOException {
                    return new Version0Response(in);
                }
                @Override
                public void handleResponse(Version0Response response) {
                    assertThat(response.value1, equalTo(1));
                }
                @Override
                public void handleException(TransportException exp) {
                    logger.error("Unexpected failure", exp);