Search in the cms does not find document by name

In the cms a document has a name and an URL path. The name is not used for the search in the cms. To reproduce:

• on a depublished document: rename it and give the name a unique value.
• enter the value in the cms search box above the document tree
• there is no result.

Pity, because the name has only one function: for the editors in the cms, and now they can't find it.