}
            }
            return new Pair<>(key, value);
        }).collect(Collectors.toMap(Pair::getFirst, Pair::getSecond));
    }

    String getIndexAdminRequiredFields();

    default boolean validateIndexRequiredFields(final Map<String, Object> source) {
        return invalidIndexRequiredFields(source).isEmpty();
    }

     * comment: Required fields for admin in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexAdminRequiredFields();

    /**
     * Get the value for the key 'index.search.timeout'. <br>
     * The value is, e.g. 3m <br>
     * comment: Timeout for index search operations.