Issues in querying nested objects

[newUserForTesting]

Hello Experts,

Our Index Mapping has several nested structures and objects within it. Just to showcase the issue, please consider the following sample mapping

PUT /sample_order
{
"mappings": {
"properties": {
"orderNo":{
"type": "text"
},
"orderLines": {
"type": "nested",
"properties": {
"item": {
"type": "object",
"properties": {
"itemDesc": {
"type": "text"
},"itemID": {
"type": "integer"
}
}
}
}
}
}
}
}

POST /sample_order/_bulk
{"index":{"_id":1}}
{"orderNo":"1","orderLines":[{"item":{"itemDesc":"SampleItemDesc1","itemID":11}}]}
{"index":{"_id":2}}
{"orderNo":"2","orderLines":[{"item":{"itemDesc":"SampleItemDesc2","itemID":22}}]}

Now if we want to run following query:
{
"query": "SELECT * FROM sample_order where orderLines.item.itemID=11",
"fetch_size": 10
}
It doesn't return any records.

If we change it to:
{
"query": "SELECT * FROM sample_order where nested(orderLines.item.itemID)=11",
"fetch_size": 10
}
It throws error mentioning:
nested object under path [orderLines.item] is not of nested type

How can we query objects inside nested structures?
Could you please assist in this Experts. We really appreciate your help!

Thanks!

[newUserForTesting]

Could someone please assist in the above query? Appreciate the help.