Remove broken compression version assertion

A recent commit added an assertion to make sure that LZ4 is not
configured on an incompatible node. This assertion is currently broken
in tests. This commit removes it.

Author: Tim-Brooks

server/src/main/java/org/elasticsearch/transport/OutboundHandler.java

@@ -93,7 +93,6 @@ void sendResponse(final Version nodeVersion, final TcpChannel channel, final lon
                       final TransportResponse response, final Compression.Scheme compressionScheme, final boolean isHandshake)
         throws IOException {
         Version version = Version.min(this.version, nodeVersion);
-        assert compressionScheme != Compression.Scheme.LZ4 || version.onOrAfter(Compression.Scheme.LZ4_VERSION);
         OutboundMessage.Response message = new OutboundMessage.Response(threadPool.getThreadContext(), response, version,
             requestId, isHandshake, compressionScheme);
         ActionListener<Void> listener = ActionListener.wrap(() -> messageListener.onResponseSent(requestId, action, response));