[{"_id":ObjectId("61eeae076a8b8709e07de3c1"),"deleted":true,"organisation":ObjectId("5c1f62f9419ff2aaaf5ad679"),"candidates":[{"details":{"progress":"1. Target Candidate","folder":"PENDING"},"applicant":ObjectId("5c0f9440f06f3b03279805c8"),"createdAt":ISODate("2018-12-12T13:37:30.825Z"),"updatedAt":ISODate("2019-01-04T14:05:13.199Z")},{"details":{"progress":"2. Target Candidate","folder":"PENDING"},"applicant":ObjectId("5c0f9440f06f3b03279805c9"),"createdAt":ISODate("2018-12-12T13:37:30.825Z"),"updatedAt":ISODate("2019-01-04T14:05:13.199Z")},{"details":{"progress":"3. Target Candidate","folder":"NOT-PENDING"},"applicant":ObjectId("5c0f9440f06f3b03279805c9"),"createdAt":ISODate("2018-12-12T13:37:30.825Z"),"updatedAt":ISODate("2019-01-04T14:05:13.199Z")}]}]

db.collection.aggregate([{$unwind:{"path":"$candidates"}},{$match:{"candidates.details.folder":{$eq:"PENDING"}}},{$replaceRoot:{"newRoot":"$candidates"}}])