inject-portfolio.js

var portfolioMaster = db.getCollection('RAW_CORE_PROJECT').aggregate([
    { $group: { 
        _id: {
            ProgramID: "$PROGRAM_ID",
            Portfolio: "$PORTFOLIO_NAME",
        }
    } },
    { $project: { 
        ProgramID: "$_id.ProgramID",
        Portfolio: "$_id.Portfolio",
        _id: 0
    } }
]).toArray()

db.getCollection('Initiative').find({ InitiativeType: "ITO" }).forEach(function (d) {
    var masterFound = portfolioMaster.find(function (g) { return g.ProgramID == d.ClarityId })
    if (typeof masterFound !== 'undefined') {
        d.Portofolio = masterFound.Portfolio // haruse portfolio, typo, ben kah
        db.getCollection('Initiative').save(d)
    }
})