I connected Tableau with success on my MongoDB database, but when I tried to join two tables, how I use DBReferences (Morphia framework on my Java project), some fields have this format: company.$id or company.$ref, and when I try to get the query result, I receive this message:

[MySQL][ODBC 5.3(w) Driver][mysqld-5.7.12 mongosqld v2.4.1]failed to execute aggregate: (Location16410) FieldPath field names may not start with '$'.
Unable to create extract
SELECT `Vulnerability`.`_id` AS `_id (Vulnerability)`,
 `Target`.`_id` AS `_id`,
 `Vulnerability`.`active` AS `active (Vulnerability)`,
 `Target`.`active` AS `active`,
 `Vulnerability`.`changedDate` AS `changedDate`,
 `Vulnerability`.`company.$id` AS `company.$id (Vulnerability)`,
 `Target`.`company.$id` AS `company.$id`,
 `Vulnerability`.`company.$ref` AS `company.$ref (Vulnerability)`,
 `Target`.`company.$ref` AS `company.$ref`,
 `Vulnerability`.`count` AS `count`,
 `Vulnerability`.`createDate` AS `createDate`,
 `Target`.`creationDate` AS `creationDate`,
 `Vulnerability`.`cvssV3.accessComplexity` AS `cvssV3.accessComplexity`,
 `Vulnerability`.`cvssV3.atackVector` AS `cvssV3.atackVector`,
 `Vulnerability`.`cvssV3.confidenciality` AS `cvssV3.confidenciality`,
 `Vulnerability`.`cvssV3.cvssScore` AS `cvssV3.cvssScore`,
 `Vulnerability`.`cvssV3.disponibility` AS `cvssV3.disponibility`,
 `Vulnerability`.`cvssV3.impact` AS `cvssV3.impact`,
 `Vulnerability`.`cvssV3.integrity` AS `cvssV3.integrity`,
 `Vulnerability`.`cvssV3.privilege` AS `cvssV3.privilege`,
 `Vulnerability`.`cvssV3.probability` AS `cvssV3.probability`,
 `Vulnerability`.`cvssV3.scopeMutable` AS `cvssV3.scopeMutable`,
 `Vulnerability`.`cvssV3.userInteraction` AS `cvssV3.userInteraction`,
 `Vulnerability`.`detail.en` AS `detail.en`,
 `Vulnerability`.`detail.es` AS `detail.es`,
 `Vulnerability`.`detail.pt` AS `detail.pt`,
 `Target`.`hostname` AS `hostname`,
 `Vulnerability`.`idGat` AS `idGat`,
 `Target`.`ipNumber` AS `ipNumber`,
 `Target`.`ip` AS `ip`,
 `Vulnerability`.`kb.$id` AS `kb.$id`,
 `Vulnerability`.`kb.$ref` AS `kb.$ref`,
 `Vulnerability`.`lastSeenDate` AS `lastSeenDate`,
 `Vulnerability`.`name.en` AS `name.en`,
 `Vulnerability`.`name.es` AS `name.es`,
 `Vulnerability`.`name.pt` AS `name.pt`,
 `Target`.`netbios` AS `netbios`,
 `Vulnerability`.`oldStatus` AS `oldStatus`,
 `Target`.`os` AS `os`,
 `Vulnerability`.`port` AS `port`,
 `Vulnerability`.`protocol` AS `protocol`,
 `Vulnerability`.`risk` AS `risk (Vulnerability)`,
 `Target`.`risk` AS `risk`,
 `Vulnerability`.`rootCause.$id` AS `rootCause.$id`,
 `Vulnerability`.`rootCause.$ref` AS `rootCause.$ref`,
 `Target`.`score` AS `score`,
 `Vulnerability`.`sourceScan` AS `sourceScan`,
 `Vulnerability`.`source` AS `source`,
 `Vulnerability`.`status` AS `status`,
 `Vulnerability`.`svcName` AS `svcName`,
 `Vulnerability`.`target.$id` AS `target.$id`,
 `Vulnerability`.`target.$ref` AS `target.$ref`,
 `Target`.`type` AS `type`,
 `Vulnerability`.`underAnalysis` AS `underAnalysis`,
 `Vulnerability`.`unmapped` AS `unmapped`,
 `Vulnerability`.`version` AS `version`
FROM `Target`
 INNER JOIN `Vulnerability` ON (`Target`.`_id` = `Vulnerability`.`target.$id`)
LIMIT 1000

I renamed the name fields too, but nothing changes. I opened an Issue on Tableau support too and They suggested me contact you to solve this problem, because they can't. My MongoDB version is v3.4.9.