Search metadata properties (last-modified) of the document using REST API search

I would like to search metadata properties 'last-modified' using REST API search. I have the equivalent cts search which is working in query console.

CTS query in qconsole which is working-

  cts.search(cts.andQuery([
 cts.propertiesFragmentQuery(
    cts.elementRangeQuery(
        xs.QName('prop:last-modified'),'>',
        "2020-04-07T10:22:55-05:00"))
        ]))

Here is the REST API search structured query I am using to execute.

http://localhost:xxxx/v1/search?format=json&pageLength=2000&start=1

{
    "search": {
        "ctsquery": {
            "andQuery": {
                "queries": [
                    {
                        "propertiesFragmentQuery": {
                            "elementRangeQuery": {
                                "property": [
                                    "xsQName('prop:last-modified')"
                                ],
                                "operator": ">",
                                "value": [
                                    {
                                        "type": "dateTime",
                                        "val": "2020-04-07T10:22:55-05:00"
                                    }
                                ]
                            }
                        }
                    }
                ]
            }
        }
    }
}

I am getting the following

error "statusCode": 500, "status": "Internal Server Error", "messageCode": "INTERNAL ERROR", "message": "XDMP-QUERYNODE: cts:query(object-node{\"andQuery\":object-node{\"queries\":array-node{object-node{\"propertiesFragmentQuery\":object-node{...}}}}}) -- Query element object-node{\"elementRangeQuery\":object-node{...}} contains unknown child . See the MarkLogic server error log for further detail."

Is something I am missing in the query or is there any other way to access the properties from REST API?

Thanks.

The error indicates the JSON serialization of the cts.query is invalid.

One way to figure out the correct serialization is to work in QueryConsole:

1. Write a cts.search() that returns the expected results for the cts.query()
2. Wrap the cts.query() in xdmp.toJSON() to produce a serialized object for the cts.query
3. Use the serialized object as the value of the ctsquery key in the payload

That should get past the XDMP-QUERYNODE error.

Hoping that helps,