/** The key of the configuration. e.g. charset */
    String QUERY_GSA_INDEX_FIELD_CHARSET = "query.gsa.index.field.charset";

    /** The key of the configuration. e.g. content_type */
    String QUERY_GSA_INDEX_FIELD_content_type_ = "query.gsa.index.field.content_type.";

    /** The key of the configuration. e.g. 4 */
    String QUERY_COLLAPSE_MAX_CONCURRENT_GROUP_RESULTS = "query.collapse.max.concurrent.group.results";