mysql - slow MongoDB with an easy query -

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I am a MongoDB starter and I have a small problem like a simple query: 

 
 Code> Db.table.find ({"text": / a /, "nb_ret": {"$ gt": 2}})   
 5min like before giving the result < / P  
  Intel Xeon E3 1225v2, 4C / 4T, 3.2GHz +, RAM: 32 Go, Disc: 2x2 to SATA   
 This is normal?   
 
 
 Your query is not easy in any way, because it involves executing a match against a regular expression is.  
 Some fixes are new to  . E.g.,  
  db.table.ensureIndex ({"text": "text"})

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