When analyzing your original update, you are essentially executing the following operation...
{
op: 'command',
ns: 'nodetest.Things',
command: {
findAndModify: 'Things',
query: { guildId: 'GOPd3ccG1f' },
remove: false,
new: false,
upsert: false,
fields: {},
update: {
'$set': { systems: { notification: { tiktok: [Object] } } }
},
lsid: { id: UUID("f4462722-1970-43c5-b2e1-b1cc5e38e9d0") },
txnNumber: Long("2"),
'$clusterTime': {
clusterTime: Timestamp(2, 1630100100),
signature: {
hash: Binary(Buffer.from("005ff0e9abe7f7386825f291dfdf769ae050f08a", "hex"), 0),
keyId: Long("6967052092213035012")
}
},
'$db': 'nodetest'
},
keysExamined: 1,
docsExamined: 1,
nMatched: 1,
nModified: 1,
nUpserted: 0,
numYield: 0,
queryHash: '6D0EBC2A',
planCacheKey: '479D3C98',
locks: {
ParallelBatchWriterMode: { acquireCount: { r: Long("2") } },
ReplicationStateTransition: { acquireCount: { w: Long("3") } },
Global: { acquireCount: { w: Long("2") } },
Database: { acquireCount: { w: Long("2") } },
Collection: { acquireCount: { w: Long("2") } },
Mutex: { acquireCount: { r: Long("2") } }
},
flowControl: { acquireCount: Long("1"), timeAcquiringMicros: Long("1") },
readConcern: { level: 'local', provenance: 'implicitDefault' },
writeConcern: { w: 'majority', wtimeout: 0, provenance: 'implicitDefault' },
responseLength: 409,
protocol: 'op_msg',
millis: 57,
planSummary: 'IXSCAN { guildId: 1 }',
execStats: {
stage: 'UPDATE',
nReturned: 1,
executionTimeMillisEstimate: 0,
works: 1,
advanced: 1,
needTime: 0,
needYield: 0,
saveState: 0,
restoreState: 0,
isEOF: 1,
nMatched: 1,
nWouldModify: 1,
nWouldUpsert: 0,
inputStage: {
stage: 'FETCH',
nReturned: 1,
executionTimeMillisEstimate: 0,
works: 1,
advanced: 1,
needTime: 0,
needYield: 0,
saveState: 1,
restoreState: 1,
isEOF: 0,
docsExamined: 1,
alreadyHasObj: 0,
inputStage: {
stage: 'IXSCAN',
nReturned: 1,
executionTimeMillisEstimate: 0,
works: 1,
advanced: 1,
needTime: 0,
needYield: 0,
saveState: 1,
restoreState: 1,
isEOF: 0,
keyPattern: { guildId: 1 },
indexName: 'guildId_1',
isMultiKey: false,
multiKeyPaths: { guildId: [] },
isUnique: true,
isSparse: false,
isPartial: false,
indexVersion: 2,
direction: 'forward',
indexBounds: { guildId: [ '["GOPd3ccG1f", "GOPd3ccG1f"]' ] },
keysExamined: 1,
seeks: 1,
dupsTested: 0,
dupsDropped: 0
}
}
},
ts: ISODate("2021-08-27T21:35:00.994Z"),
client: '127.0.0.1',
allUsers: [ { user: 'barry', db: 'admin' } ],
user: 'barry@admin'
}
This approach is updating the systems.notification.tiktok object with a new object, not just the endCooldown field. If you wish to specifically modify only the endCooldown field, you should provide a targeted update like this...
GuildSchema.findOneAndUpdate({guildId: id}, { "$set": { "systems.notification.tiktok.endCooldown": String(Date.now() + 86400000)}}, () => {});