App migration, mongoDB error

We are trying to change a server.
During the database loading procedure an error occurs:

2019-03-10T21:26:19.854+0100 Failed: mo1120_rock2.assets.chunks: error creating indexes for mo1120_rock2.assets.chunks: createIndex error: The field 'w' is not valid for an index specification. Specification: { w: 1, name: "files_id_1_n_1", ns: "mo1120_rock2.assets.chunks", key: { files_id: 1, n: 1 } }

Rocket.Chat v0.74.1 (updated)

Do you know any solution for this problem?