public List<String> getReadings() {
        return readings;
    }

    /**
     * Returns the list of fields.
     *
     * @return the list of fields
     */
    public List<String> getFields() {
        return fields;
    }

    /**
     * Returns the list of tags.
     *
     * @return the list of tags
     */
    public List<String> getTags() {
        return tags;
    }

        source.put(ELEVATE_WORD_BOOST, elevateWord.getBoost());
        source.put(ELEVATE_WORD_READING, elevateWord.getReadings());
        source.put(ELEVATE_WORD_FIELDS, elevateWord.getFields());
        source.put(ELEVATE_WORD_TAGS, elevateWord.getTags());
        source.put(ELEVATE_WORD_ROLES, elevateWord.getRoles());