Throw UOE from compressible bytes stream reset

A compressible bytes output stream is a stream output which supports a
reset method. However, compressible bytes output streams are unusual in
that the current implementation sometimes supports a reset (if the
stream is not compressed) and sometimes does not support a rest (if the
stream is compressed). This inconsistent behavior is puzzling and
instead we should simply always throw an unsupported operation
exception.

Relates #27564

core/src/main/java/org/elasticsearch/transport/CompressibleBytesOutputStream.java

@@ -104,6 +104,6 @@ final class CompressibleBytesOutputStream extends StreamOutput {
 
     @Override
     public void reset() throws IOException {
-        stream.reset();
+        throw new UnsupportedOperationException();
     }
 }