[mongodb-user] I Want To Populate OR Search... Plz Help Me

first, I can't speak English well.. Understanding me
I have this model
var user = mongoose.Schema({
email: ....
password: .....
name : ...
company : ...
position : ....
phoneNumber : ...
signDate : Date,
friends: [{ type : mongoose.Schema.Types.ObjectId ,unique: true, ref: 
'user' }],
accessToken: .....
}); 
and 
var friend = mongoose.Schema({
friends: [{ type : mongoose.Schema.Types.ObjectId ,unique: true, ref: 
'user' }]
});
Using these two, I want to search all the fields using a single keyword.
        var fds = new Friend;
User.findOne({email : user.email})
.populate({ 
 path : 'friends',
 match     : ''''empty''''
})
.exec(function (err, fd) {
 if(!err){
  fds = fd.friends;
  res.render('account/friend', { layout: false, user: user, friends: fds });
 }else{ console.log(err)}
});
I don't know what to put in that empty space...
var term = new RegExp(req.body.inputAll, 'i');
User.find().or([{ email: { $regex: term }}, 
               { name: { $regex: term }}, 
               { company: { $regex: term }}, 
               { position: { $regex: term }}, 
               { phoneNumber: { $regex: term }}])
Elsewhere this was the word OR search. But I don't know populate OR search.
or other way besides to using the Match?
please, help me...
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