Split Values in Search Index

Following Scenario:

• SiteColumn called "MultiUser" with type User, allowing multiple values.


• MultiUser added to a Library


• 
  

  Multiple users added per item e.g.:

  
  

  
  [Title]   [MultiUser]
  Item1     Mike; Marc; Tom
  Item2     Marc; Björk
  
  



• 
  

  Add a managed property "MultiUserMP" with type text and mapping to crawled property "ows_MultiUser" allowing multiple values

  
  


• Full crawl

Problem: Unfortunately, the multi value column is not represented in the index! Meaning that the index is not:

    [Title]   [MultiUser]
    "Item1"   "Mike", "Marc", "Tom"
    "Item2"   "Marc", "Björk"

but:

    [Title]   [MultiUser]
    "Item1"   "Mike; Marc; Tom"
    "Item2"   "Marc; Björk"

How to fix that? It is in particular a problem, since I want to use the Refiner Table ...