@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if ( ! (o instanceof Response)) return false;
        Response response = (Response) o;
        return requestId == response.requestId &&
               Objects.equals(textMessage, response.textMessage) &&
               outcome == response.outcome;
    }
Returns the trace of this operation, or null if there is none.
documentapi/src/main/java/com/yahoo/documentapi/Response.java