Missing id JSON - GET

Question

I've made couple of registries in my database (mongodb), when i try to get @localhost:8080/ {for example company} info about collection I can't see ID of documents, which I clearly entered.

Any ideas how can i fix it and show id ?

{
    "name" : "google",
    "person" : null,
    "_links" : {
    "self" : {
        "href" : "http://localhost:8080/company/2"
}