Not picking Index - when querying Object -> array -> Object in N1QL - nosql

Question

Index not picking when using N1QL to match all the customers belonging to a country
Note : the bucket has around 10 lack records, the document is fetching after 50 seconds,
query
select * from `user-prof` WHERE ANY item IN devices.location SATISFIES item.country IN ["US"]
index
CREATE INDEX id_userProfile ON `user-prof` ( ALL ARRAY v.country FOR v IN devices.location END )
Document
[
{
"customers": {
"devices": {
"user": "u1",
"custid": "14CE5534CCE",
"token": "4D5BE85896833148D696A1397C",
"guest": {
"lastActive": null,
"searches": [
]
},
"latt": "6655059908",
"locale": "en-US",
"location": [
{
"city": "Afc",
"country": "IN"
},
{
"city": "Newyork",
"country": "US"
},
{
"city": null,
"country": null
}
],
"long": "4.21787927806",
"notify": {
"Stats": false
},
"tier": null,
"tmz": "EU",
"version": "0.1"
}
}
},
{
"customers": {
"devices": {
"user": "u2",
"custid": "64CE5534CC1E",
"token": "6D5BE85896833148D696A1397C",
"guest": {
"lastActive": null,
"searches": [
]
},
"latt": "6655059908",
"locale": "en-US",
"location": [
{
"city": "Texas",
"country": "US"
},
{
"city": null,
"country": null
}
],
"long": "4.21787927806",
"notify": {
"Stats": false
},
"tier": null,
"tmz": "EU",
"version": "0.1"
}
}
}

Answer 1

You are using Pre 4.6.2 The variable in the ANY clause needs to be same as the variable in the CREATE INDEX (i.e item ,v )
https://developer.couchbase.com/documentation/server/current/n1ql/n1ql-language-reference/indexing-arrays.html