Wizard like search on arrays fields

Working with Data
,
#1

Hello everyone, I have the following structure:

{
    id;
    userId;
    answersQuestion1: ["A1", "A2"],
    answersQuestion2: ["A1", "A2", "A3"],
    answersQuestion3: ["A1"]
}

The user will follow a wizard asking for several questions where only one answer can be selected. The documents may match more than one answer per question. Now I need to find all the documents where the given set of answer matches (exact or not) the answer specified in the documents. For example, lets say I have two questions

Q2: "Which programming language do you prefer?" 
       Answers: "Java", "C" "Python"

Q1: "What is your experience in this programming language?"
       Answers: "None", "Low", "Medium", "Experienced"

and lets say I have a document as the following:

{
    id;
    userId;
    answersQuestion1: ["C", "Python"],
    answersQuestion2: ["None", "Low"]
}

And that the user will pick the following answers:

Q1: "C"
Q2: "Low"

At the moment I have an index for each answer_array-userId pair

ensureIndex("userId", "answersQuestion1"); ensureIndex("userId", "answersQuestion2"); ...

since we cannot have multikey indexes on arrays. And I just use an $in operator to perform the query.

To me this does not look very efficient, I suppose mongo will pick the best index and perform a document scan to match the other answers.

I was wondering whether it would make sense to create a text containing something like:

C Python None Low

And perform a text search. I will then filter out the documents where the score less than a given threshold.

Potentially, for more granulated search I could use something like:

A1C A1Python A2None A2Low

And prefix the user answer with the A1 or A2.

This is just a guess, maybe Im completly off. Would that make sense?

Thank you