Description

The new Materialized View documentation page references a possibly-deprecated function.

https://docs.mongodb.com/master/core/materialized-views/

The Materialized View Definition example below will not allow the Perform Initial Run step to run against 4.2 server until 'replaceWithNew' is replaced with simply 'replace':

updateMonthlySales = function(startDate) {
db.bakesales.aggregate( [
{ $match: { date:

{ $gte: startDate }

} },
{ $group: { _id: { $dateToString:

{ format: "%Y-%m", date: "$date" }

}, sales_quantity: { $sum: "$quantity"}, sales_amount: { $sum: "$amount" } } },
{ $merge: { into: "monthlybakesales", whenMatched: "replaceWithNew" } }
] );
};

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)