final Object obj = get(key);

        final float value;
        if (obj == null) {
            value = defaultValue;
        } else {
            value = Float.parseFloat(obj.toString());
        }

        return value;
    }

    /**
     * Retrieves a setting value as a boolean.
     * @param key The key of the setting.

        final long docFreq = Long.parseLong(source.get(FieldNames.DOC_FREQ).toString());
        final long queryFreq = Long.parseLong(source.get(FieldNames.QUERY_FREQ).toString());
        final float userBoost = Float.parseFloat(source.get(FieldNames.USER_BOOST).toString());
        final List<String> tags = SuggestUtil.getAsList(source.get(FieldNames.TAGS));
        final List<String> roles = SuggestUtil.getAsList(source.get(FieldNames.ROLES));