Mongodb : UpdateMany with filter field IN another collection

Question

Is there any way to updateMany a collection where the filter is a IN condition from another collection.

In SQL it would be :

UPDATE collection1
SET field1 = true
WHERE _id IN (SELECT _id FROM collection2)

Input collections

collection1 :  [{"_id" : "1", "field1": false},  {"_id" : "2", "field1": false} ]

collection2 : [{"_id" : "1"}, {"_id" : "3"}]

Expected result

collection1 :  [{"_id" : "1", "field1": true},  {"_id" : "2", "field1": false} ]

Answer 1

Based on @ray comment here is my finding.
You can use an aggregation pipeline with a $merge into the current collection using whenMatched: 'replace' and whenNotMatched: 'discard'

db.collection1.aggregate([
    {
        $lookup: {
            from: 'collection2',
            localField: '_id ',
            foreignField: '_id',
            as: 'collection2_docs'
        }
    },
    {
        //SIMULATE THE INNER JOIN
        $unwind: "$collection2_docs"
    },
    {
        //Update the field
        $set: {
            "field1": true

        }
    },
    {
        //REMOVE THE lookup projection
        $project: {
            collection2_docs: 0

        }
    },
    {
        // Merge into the current collection using whenMatched: 'replace and whenNotMatched: 'discard'
        $merge: {
            into: 'collection1',
            whenMatched: 'replace',
            whenNotMatched: 'discard'
        }
    }
]);