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File uploads very slow after migration to wiredTiger

This issue only occurs when the storage type is GridFS and can be resolved by re-creating the index. For docker installation, use the below commands to create the index:
  1. 1.
    docker exec -it mongodb mongo
  2. 2.
    use rocketchat
  3. 3.
    db.rocketchat_uploads.chunks.createIndex( { files_id: 1, n: 1 }, { unique: true } )