Upgrade Nuxeo FT 9.1 to Nuxeo Lts 2017- How to migrate postgres table into MongoDB

[Chaitanya_Datkh]

Hi We are planing to upgrade Nuxeo FT 9.1 to Nuxeo LTS 2017. Since in Nuxeo LTS 2017 there is no postgres, we need to migrate existing user/group data from postgres to mongodb. Please provide any documentation for the same.