<?xml version="1.0" encoding="UTF-8"?>
<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping"
                        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                        xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping
                        http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">

    <document name="Vespolina\Entity\Order\Order" collection="v_order">
        <field name="id" id="true" />

    </document>
</doctrine-mongo-mapping>
<?xml version="1.0" encoding="UTF-8"?>
<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping"
                        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                        xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping
                        http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">

    <document name="Vespolina\Entity\Order\Order" collection="v_order">
        <field name="id" id="true" strategy="INCREMENT" />

    </document>
</doctrine-mongo-mapping>

Use INCREMENT as default strategy
Use INCREMENT as default strategy