buf.append(requestedTime);
            final String[] relatedQueries = relatedQueryHelper.getRelatedQueries(params.getQuery());
            buf.append(",\"related_query\":");
            buf.append(escapeJson(relatedQueries));
            final String[] relatedContents = relatedContentHelper.getRelatedContents(params.getQuery());
            buf.append(",\"related_contents\":");
            buf.append(escapeJson(relatedContents));

        }
    }

    // Mock classes for addSearchLog tests

    private static class MockSearchRequestParams extends SearchRequestParams {
        @Override
        public String getQuery() {
            return "test query";
        }

        @Override
        public Map<String, String[]> getFields() {
            return Collections.emptyMap();
        }

        @Override