public long getDocumentWordsNum() {
        return getNum(QueryBuilders.rangeQuery(FieldNames.DOC_FREQ).gte(1));
    }

    /**
     * Returns the number of query words in the suggestion index.
     * @return The number of query words.
     */
    public long getQueryWordsNum() {
        return getNum(QueryBuilders.rangeQuery(FieldNames.QUERY_FREQ).gte(1));
    }

    private long getNum(final QueryBuilder queryBuilder) {

        analyzerMapping.put(FieldNames.ANALYZER_SETTINGS_TYPE, AnalyzerSettings.FIELD_ANALYZER_MAPPING);
        analyzerMapping.put(FieldNames.ANALYZER_SETTINGS_FIELD_NAME, field);
        analyzerMapping.put(FieldNames.ANALYZER_SETTINGS_CONTENTS_ANALYZER, "title_contents_analyzer");
        analyzerMapping.put(FieldNames.ANALYZER_SETTINGS_CONTENTS_READING_ANALYZER, "");
        runner.client()