title: elasticsearch custom tokenizer - split token by length
body: <p>I am using elasticsearch version 1.2.1.
  I have a use case in which I would like to create a custom tokenizer that will break the tokens by their length up to a certain minimum length. For example, assuming minimum length is 4, the token "abcdefghij" will be split into:
  "abcd efgh ij".</p>
  
  <p>I am wondering if I can implement this logic without the need of coding a custom Lucene Tokenizer class?</p>
  
  <p>Thanks in advance.</p>