How to find count of multiple fields in MongoDb

Problem Statement:
I have a use case where i need to find the count of activity done on JobId.
I have a mongodb collection jobslog which has following data

jobId,action
1 a (apply)
2       v (view)
3      a (apply)
1 v (view)

I knew the query in mysql
select count(a),count(v) from jobslog group by jobId

But I do not know how to do it in Mongo.So i did lots of search on google for that.

Solution:
Query In MongoDB
db.jobslog.aggregate([
                    { $group: {
                        _id: "$jobId",
                         view_count: { $sum: {
                                        $cond: [ { $eq: [ '$a', 'v' ] }, 1, 0 ]
                                     } },
                         apply_count: { $sum: {
                                        $cond: [ { $eq: [ '$a', 'a' ] }, 1, 0 ]
                                     } },
                     }},
                     { $out : output_collection_name }

])