var bulk = db.application_details.initializeUnorderedBulkOp();
var ops = 0, myDoc;
var docs = db.application_details.find({ gpsTime: { $type: 'string' } }).limit(10000).toArray();
while (docs && docs.length) {
	for(var i = 0; i< docs.length; i++) {
			myDoc = docs[i];
			bulk.find({ _id: myDoc._id }).updateOne(
				{ 
				  $set : { gpsTime: parseFloat(myDoc.gpsTime) } 
				}
			);
			if ((++ops % 1000) === 0){
			  print (ops);
			  bulk.execute();
			  bulk = db.application_details.initializeUnorderedBulkOp();
			}
	}
	bulk.execute();

	docs = db.application_details.find({ gpsTime: { $type: 'string' } }).limit(10000).toArray();
    bulk = db.application_details.initializeUnorderedBulkOp();
}
bulk.execute();