Re-Index does not delete missing nested objects

[creaticious (Lars)]

Hey guys,

we have an product index with a nested field "dates". Let's say we put a product in it by:

PUT products/basics/1
{
    "sku" : "12345",
    "title" : "test product",
    "image" : "test_high.jpg",
    "productmanager": "none",
    "dates":[
      {
        "date-origin": "01.01.2018",
        "date-destination": "10.01.2018",
        "instock": 1
      },
      {
        "date-origin": "20.01.2018",
        "date-destination": "30.01.2018",
        "instock": 0
      }
    ]
}

Now if we want to update it by doing this again with changed values and one missing nested object...like:

PUT products/basics/1
{
    "sku" : "12345",
    "title" : "test product new",
    "image" : "test_high_new.jpg",
    "productmanager": "someone",
    "dates":[
      {
        "date-origin": "01.01.2018",
        "date-destination": "10.01.2018",
        "instock": 1
      }
    ]
}

...the second object in "dates" will not be deleted...

How could i tell ES to delete the missing nested objects when updating the document?

Thank you!