Fix

Author: Tim-Brooks

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

@@ -114,7 +114,7 @@ private void writeAdditionalPages(byte[] b, int offset, int length) {
     public void writeUTF8String(String str) throws IOException {
         final int charCount = str.length();
         if (charCount == 0) {
-            writeVInt(0);
+            writeByte((byte) 0);
             return;
         }