[{"services":[{"location":[17.4374614,78.7482878]},{"location":[17.4020637,78.18400519324596]},{"location":[17.56208737,78.284005186526]},{"location":[17.5620637,78.3240051999554]}]}]

db.collection.aggregate([{"$project":{"result":{"$reduce":{"input":"$services.location","initialValue":[],"in":{"$concatArrays":["$$this","$$value"]}}}}}])