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db.collection.aggregate([{$match:{/** your query*/}},{$facet:{jobs:[{$unwind:"$jobs"},{$replaceRoot:{newRoot:"$jobs"}}],applications:[{$unwind:"$application"},{$replaceRoot:{newRoot:"$application"}}]}},{$addFields:{"merged":{"$concatArrays":["$jobs","$applications"]}}},{$unwind:"$merged"},{"$replaceRoot":{"newRoot":"$merged"}}])