Firebase Promises and retun values - firebase

Question

I'm trying to match infos from different places and construct the response for this function in firebase.
The problem is the return statements, they return an unexpected jSON
I need to fetch a match from the matchId, the match contains a list of playersId.
I need to get all the profiles for those players and return them.
Current code:
exports.getUsersForMatch = functions.https.onCall((data, context) => {
matchId = data.matchId;
return store.collection('match').doc(matchId).get().then(doc => {
return doc.data().playersid;
}).then(playersId => {
return combineUsers(playersId)
}).catch((error) => {
console.log("Error getting documents: ", error);
throw err;
});
});
function combineUsers(playersId) {
users = [];
for (var i = 0; i < playersId.length; i++) {
user = getUser(playersId[i])
users.push(user);
}
return Promise.all(users)
}
function getUser(userID) {
return store.collection('user').doc(userID).get().then(user => {
return user;
}).catch((error) => {
console.log("Error getting documents: ", error);
throw err;
});
}
From the app side i receive this:
[{
"_createTime": {
"_nanoseconds": 853961000,
"_seconds": 1563270188
},
"_fieldsProto": {
"number": {
"valueType": "integerValue",
"integerValue": "1"
},
"id": {
"stringValue": "SFWxifRwJ9crta4lpPUbLq5d34v1",
"valueType": "stringValue"
},
"point ": {
"valueType": "integerValue",
"integerValue": "0"
}
},
"_ref": {
"_firestore": {
"_clientPool": {
"clientFactory": {},
"concurrentOperationLimit": 100,
"activeClients": {}
},
"_settings": {
"firebaseVersion": "8.2.0",
"libName": "gccl",
"projectId": "***",
"libVersion": "2.2.4 fire/8.2.0"
},
"_lastSuccessfulRequest": 1563698812565,
"_settingsFrozen": true,
"_serializer": {
"timestampsInSnapshots": true,
"createReference": {}
},
"_preferTransactions": true,
"_projectId": "football-5290b"
},
"_path": {
"databaseId": "(default)",
"_projectId": "***"
"segments": ["user", "SFWxifRwJ9crta4lpPUbLq5d34v1"]
}
},
"_serializer": {
"timestampsInSnapshots": true,
"createReference": {}
},
"_readTime": {
"_nanoseconds": 491530000,
"_seconds": 1563698812
},
"_updateTime": {
"_nanoseconds": 179584000,
"_seconds": 1563304513
}
}, {
"_createTime": {
"_nanoseconds": 759742000,
"_seconds": 1563288148
},
"_fieldsProto": {
"number": {
"valueType": "integerValue",
"integerValue": "2"
},
"id": {
"stringValue": "S28K3KDrwYPjVHvSOHu29umCGra2",
"valueType": "stringValue"
},
"point ": {
"valueType": "integerValue",
"integerValue": "0"
}
},
"_ref": {
"_firestore": {
"_clientPool": {
"clientFactory": {},
"concurrentOperationLimit": 100,
"activeClients": {}
},
"_settings": {
"firebaseVersion": "8.2.0",
"libName": "gccl",
"_projectId": "***"
"libVersion": "2.2.4 fire/8.2.0"
},
"_lastSuccessfulRequest": 1563698812565,
"_settingsFrozen": true,
"_serializer": {
"timestampsInSnapshots": true,
"createReference": {}
},
"_preferTransactions": true,
"_projectId": "***"
},
"_path": {
"databaseId": "(default)",
"_projectId": "***"
"segments": ["user", "S28K3KDrwYPjVHvSOHu29umCGra2"]
}
},
"_serializer": {
"timestampsInSnapshots": true,
"createReference": {}
},
"_readTime": {
"_nanoseconds": 495247000,
"_seconds": 1563698812
},
"_updateTime": {
"_nanoseconds": 480467000,
"_seconds": 1563304509
}
}]