db
.getCollection('test')
.aggregate([
{$project:
 {versions:
  {$filter:
   {input: '$versions',
    as: 'version',
    cond:
    {
        $or: [
        {$gte: ['$$version.delete', 3]},
        {'$$version.delete': {$exists: false}}
        ]
    }
   }
  }
 }
}
])