Regarding Needs to create an Index on MongoDB for $lookup query - node.js

Question

I have 3 different collections which has build relation with the another field then primary id.
For ex, I have users, educations and user profiles 3 different collection and users and educations have relation with key user_id of user and same for userinfo. please find sample data.
let users = [
{ _id: ObjectId("1"), user_id: 1, name: "Nitin", is_active: true, is_deleted: false },
{ _id: ObjectId("2"), user_id: 2, name: "Vishal", is_active: true, is_deleted: false },
]
let educations =
[
{ _id: ObjectId("33"), user: 1, std: "10", is_active: true, is_deleted: false },
{ _id: ObjectId("44"), user: 2, std: "8", is_active: true, is_deleted: false },
]
let userinfo = [
{ _id: ObjectId("33"), user: 1, weight: "50", is_active: true, is_deleted: false },
{ _id: ObjectId("44"), user: 2, weight: "45", is_active: true, is_deleted: false },
]
Now I would like to fetch the relation data and created query by using $lookup by following way.
let criteria = {
is_active: true,
is_deleted: false,
};
const result = await mongoose.connection.db.collection('users').aggregate([
//education
{ $lookup: { from: "education", localField: "user_id", foreignField: "user", as: "education" } },
{ $unwind: { path: "$education", preserveNullAndEmptyArrays: true } },
//userinfo
{ $lookup: { from: "userinfo", localField: "user_id", foreignField: "user", as: "userinfo" } },
{ $unwind: { path: "$userinfo", preserveNullAndEmptyArrays: true } },
{ $match: { is_deleted: false } },
{ $match: criteria },
{
"$facet": {
"totalLocation": [
{ $match: criteria },
{ "$count": "count" },
],
}
},
{
"$project": {
"totalLocation": { "$arrayElemAt": ["$totalLocation.count", 0] },
}
}
], { allowDiskUse: true, collation: { locale: 'en_US', alternate: "shifted" } }).toArray();
This query works completely fine and return data as expected. But now as data are growing so this query became slower and we would make it faster. one of solution which I found that to create an index in a way so we can have faster result. I have tried but it doesn't works for me
so can anyone help me to create a index on this kind of query. or any another solution.
Explanation as requested in comment
{
"stages" : [
{
"$cursor" : {
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "mydata.users",
"indexFilterSet" : false,
"parsedQuery" : {
"is_deleted" : {
"$eq" : false
}
},
"queryHash" : "242D9E6F",
"planCacheKey" : "386E80BB",
"winningPlan" : {
"stage" : "PROJECTION_SIMPLE",
"transformBy" : {
"cb_id" : 1,
"user" : 1,
"_id" : 0
},
"inputStage" : {
"stage" : "COLLSCAN",
"filter" : {
"is_deleted" : {
"$eq" : false
}
},
"direction" : "forward"
}
},
"rejectedPlans" : []
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 2328,
"executionTimeMillis" : 265,
"totalKeysExamined" : 0,
"totalDocsExamined" : 2355,
"executionStages" : {
"stage" : "PROJECTION_SIMPLE",
"nReturned" : 2328,
"executionTimeMillisEstimate" : 10,
"works" : 2357,
"advanced" : 2328,
"needTime" : 28,
"needYield" : 0,
"saveState" : 3,
"restoreState" : 3,
"isEOF" : 1,
"transformBy" : {
"cb_id" : 1,
"user" : 1,
"_id" : 0
},
"inputStage" : {
"stage" : "COLLSCAN",
"filter" : {
"is_deleted" : {
"$eq" : false
}
},
"nReturned" : 2328,
"executionTimeMillisEstimate" : 0,
"works" : 2357,
"advanced" : 2328,
"needTime" : 28,
"needYield" : 0,
"saveState" : 3,
"restoreState" : 3,
"isEOF" : 1,
"direction" : "forward",
"docsExamined" : 2355
}
}
}
},
"nReturned" : NumberLong(2328),
"executionTimeMillisEstimate" : NumberLong(20)
},
{
"$lookup" : {
"from" : "education",
"as" : "education",
"localField" : "user_id",
"foreignField" : "user",
"unwinding" : {
"preserveNullAndEmptyArrays" : true
}
},
"nReturned" : NumberLong(2328),
"executionTimeMillisEstimate" : NumberLong(136)
},
{
"$lookup" : {
"from" : "userinfo",
"as" : "userinfo",
"localField" : "user_id",
"foreignField" : "user",
"unwinding" : {
"preserveNullAndEmptyArrays" : true
}
},
"nReturned" : NumberLong(2328),
"executionTimeMillisEstimate" : NumberLong(264)
},
{
"$facet" : {
"totalLocation" : [
{
"$teeConsumer" : {},
"nReturned" : NumberLong(2328),
"executionTimeMillisEstimate" : NumberLong(264)
},
{
"$group" : {
"_id" : {
"$const" : null
},
"count" : {
"$sum" : {
"$const" : 1
}
}
},
"nReturned" : NumberLong(1),
"executionTimeMillisEstimate" : NumberLong(264)
},
{
"$project" : {
"count" : true,
"_id" : false
},
"nReturned" : NumberLong(1),
"executionTimeMillisEstimate" : NumberLong(264)
}
]
},
"nReturned" : NumberLong(1),
"executionTimeMillisEstimate" : NumberLong(264)
},
{
"$project" : {
"_id" : true,
"totalLocation" : {
"$arrayElemAt" : [
"$totalLocation.count",
{
"$const" : 0.0
}
]
}
},
"nReturned" : NumberLong(1),
"executionTimeMillisEstimate" : NumberLong(264)
}
],
"serverInfo" : {},
"ok" : 1.0
}
Thanks