Do not zero out pages for bytes output stream (#36523)

Currently, the `BytesStreamOutput` always zeros out the underlying byte
pages when they are acquired. This should not be necessary as the stream
overwrites the underlying bytes as serialization occurs.

server/src/main/java/org/elasticsearch/common/io/stream/BytesStreamOutput.java

@@ -59,7 +59,7 @@ public class BytesStreamOutput extends BytesStream {
 
     protected BytesStreamOutput(int expectedSize, BigArrays bigArrays) {
         this.bigArrays = bigArrays;
-        this.bytes = bigArrays.newByteArray(expectedSize);
+        this.bytes = bigArrays.newByteArray(expectedSize, false);
     }
 
     @Override