master_group_policies.js

db.livepolicies.aggregate()
    .match({
        masterGroupID1Count: {
            $exists: true
        }
    })
    .project({
        'DateString': {
            $dateToString: {
                format:'%Y-%m-%d',
                timezone: "Europe/London",
                date: '$etlDate'
            }
        },
        'Boiler': '$masterGroupID1Count',
        'Appliance': '$masterGroupID2Count',
        'Home Emergency': '$masterGroupID3Count',
        'Car': '$masterGroupID4Count',
    })
    .sort({ etlDate: -1 })