@Override
    protected void onDeserialize(Deserializer buf) {
        // We expect the UTF-8 we get from the backend to be pre-checked and valid.
        utf8Value = getRawUtf8Bytes(buf);
    }
Sets the value of this result.

@param value The value to set.
@return This, to allow chaining.
searchlib/src/main/java/com/yahoo/searchlib/expression/StringResultNode.java