* The value is, e.g. charset <br>
     * comment: Charset field for GSA index queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryGsaIndexFieldCharset();

    /**
     * Get the value for the key 'query.gsa.index.field.content_type.'. <br>
     * The value is, e.g. content_type <br>
     * comment: Content type field for GSA index queries.