By default, when custom fields are created, a searchVector field is
created based on the "name" field, which is also the label identifier by
default.
When this label identifier is updated, we want to update the
searchVector field to use this field as searchable field instead, if it
is of "searchable type" (today it is only possible to select a text or
number field as label identifier, while number fields are not
searchable).
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