Refactor `AbstractSimpleTransportTestCase` and `MockTransportService` to not use `Version.transportVersion` 
test/framework/src/main/java/org/elasticsearch/transport/AbstractSimpleTransportTestCase.java
logger.error("Unexpected failure", e);
                    fail(e.getMessage());
                }
            }
        );
        Future<StringMessageResponse> res = submitRequest(
            serviceB,
            nodeA,
            "internal:sayHello",
            new StringMessageRequest("moshe"),
            new TransportResponseHandler<StringMessageResponse>() {
                @Override
                public StringMessageResponse read(StreamInput in) throws IOException {
                    return new StringMessageResponse(in);
                }
                @Override
                public String executor() {
                    return ThreadPool.Names.GENERIC;
                }
                @Override
                public void handleResponse(StringMessageResponse response) {
                    assertThat("hello moshe", equalTo(response.message));
                }
                @Override
                public void handleException(TransportException exp) {
                    logger.error("Unexpected failure", exp);
                    fail("got exception instead of a response: " + exp.getMessage());
                }
            }
        );