es for text type word is actually stored, but sometimes in the polymerization time, will find that in this case, the field will be polymerized after word. For example, (1) A, B (2) B, C and B after polymerization is 2, A and C each.
That all depends on business needs, and if you really need this, it is a perfect fit, and if you do not want that word up and then polymerized, is the need to set up the fields keyword, because the keyword is not the word.