title: What columns get searched in Sonata-Admin global search
body: <p>The global search option in Sonata Admin searches trough all the (doctrine2) entities that have Admin Classes associated with them. </p>
  
  <p>What I am trying to figure out is how to configure what columns get searched by the global search. In my clients website it seems to be searching trough all VARCHAR fields (doctrine type: string) and not the TEXT fields (doctrine type: text). </p>
  
  <p>Does anybody know why this is, and how it can be changed?</p>