Change log for FORTINET_FORTIEDR

Date	Changes
2023-08-07	Enhancement: - Added Grok pattern to handle new log format.
2023-07-06	Enhancement: - Mapped "device_name" to "principal.hostname". - Mapped "Component Name" to "additional.fields". - Mapped "process_name" to "principal.application". - Mapped "Operating System" to "principal.platform". - Mapped "os_version" to "principal.platform_version". - Mapped "userId" to "principal.user.userId". - Mapped "userDisplayName" to "principal.user.userId". - Mapped "event_id" to "metadata.product_log_id". - Mapped "mac_address" to "principal.mac". - Mapped "Organization" to "additional.fields". - Mapped "dst" to "target.ip". - Mapped "intermediary_ip" to "intermediary.ip". - Mapped "server_host" to "security_result.detection_fields". - Mapped "description_details" to "metadata.description".
2023-05-09	- Added Grok pattern to handle unparsed logs. - Mapped the field "Destination" to "target.ip". - Mapped the "metadata.event_type" to "USER_LOGIN" where the field "description" contains "System login". - Mapped the "metadata.event_type" to "USER_LOGOUT" where the field "description" contains "System logout". - Changed the "metadata.event_type" from "GENERIC_EVENT" to "USER_UNCATEGORIZED" where "target.user.userid" is not null.