feat: Response a element with filter by identifier.

[EdwinBetanc0urt]

Currently when filtering by identifier (which like the uuid is unique) it replaces the structure within a hierarchy, instead of response values directly in the root of the json.

Before this changes

{
    "browser": {
        "uuid": "8aaf0086-fb40-11e8-a479-7a0060f0aa01",
        "id": 50018,
        "code": "Activities Progress Monitor",
        "name": "Monitor de Progreso de Actividades",
        "description": "Monitor de Progreso de Actividades",
        "help": null,
        "is_execute_query_by_default": false,
        "is_collapsible_by_default": false,
        "is_selected_by_default": false,
        "is_show_total": false,
        "field_key": "OA_PP_Order_Node_ID",
        "access_level": "3",
        "is_updateable": false,
        "is_deleteable": false,
        "table_name": null,
        "table": null,
        "index_value": "browser_es_mx_11",
        "language": "es_MX",
        "client_id": 11,
        "role_id": null,
        "user_id": null,
        "context_column_names": [],
        "process_id": 0,
        "process": null,
        "window_id": 53009,
        "window": {
            "id": 53009,
            "uuid": "a521e6f4-fb40-11e8-a479-7a0060f0aa01",
            "name": "Orden de Manufactura",
            "description": "Mantenimiento de órdenes de manufactura",
            "help": "Manufacturing Schedule is a document group of documents or schedule identity  conveying authority for the manufacture of specified parts or products in specified quantities."
        },
        "display_fields": [],
        "criteria_fields": [],
        "identifier_fields": [],
        "order_fields": [],
        "editable_fields": []
    }
}

After this changes

{
    "uuid": "8aaf0086-fb40-11e8-a479-7a0060f0aa01",
    "id": 50018,
    "code": "Activities Progress Monitor",
    "name": "Monitor de Progreso de Actividades",
    "description": "Monitor de Progreso de Actividades",
    "help": null,
    "is_execute_query_by_default": false,
    "is_collapsible_by_default": false,
    "is_selected_by_default": false,
    "is_show_total": false,
    "field_key": "OA_PP_Order_Node_ID",
    "access_level": "3",
    "is_updateable": false,
    "is_deleteable": false,
    "table_name": null,
    "table": null,
    "index_value": "browser_es_mx_11",
    "language": "es_MX",
    "client_id": 11,
    "role_id": null,
    "user_id": null,
    "context_column_names": [],
    "process_id": 0,
    "process": null,
    "window_id": 53009,
    "window": {
        "id": 53009,
        "uuid": "a521e6f4-fb40-11e8-a479-7a0060f0aa01",
        "name": "Orden de Manufactura",
        "description": "Mantenimiento de órdenes de manufactura",
        "help": "Manufacturing Schedule is a document group of documents or schedule identity  conveying authority for the manufacture of specified parts or products in specified quantities."
    },
    "display_fields": [],
    "criteria_fields": [],
    "identifier_fields": [],
    "order_fields": [],
    "editable_fields": []
}