{
"_id": "1",
"demands": [
{
"dp": {
"name": "ABCDDD"
},
"old_field_name": "some value"
}
]
}
{
"_id": "2",
"demands": [
{
"dp": {
"name": "ABCEEE"
},
"old_field_name": "some value"
},
{
"dp": {
"name": "XYZ"
},
"field_name": "some value"
}
]
}