Update an Entity

{
    "Key": "64263626247",
    "FamilyKey": "64251784124",
    "SeqNum": 1,
    "Fields": [
        {
            "key": "64251784148",
            "value": "description changed"
        },
        {
            "id": "MI_EQUIP000_EQUIP_ID_C",
            "value": "equip id changed"
        }
    ]
}