suppress raw type warning in IDEA

Author: Vladimir Kotal

suggester/src/main/java/org/opengrok/suggest/popular/impl/chronicle/BytesRefSizedReader.java

@@ -46,6 +46,7 @@ private BytesRefSizedReader() {
 
     @NotNull
     @Override
+    @SuppressWarnings("rawtypes")
     public BytesRef read(Bytes in, long size, @Nullable BytesRef using) {
         if (size < 0L || size > (long) Integer.MAX_VALUE) {
             throw new IORuntimeException("byte[] size should be non-negative int, " +