Term suggester option for increased word length

I am using the Term Suggester found here:

When send the text of "yo" for term suggest I expect to receive "young" in
the returned options. It is a high frequency word in the data. However, I
need to send 4 letters in order to make it to appear.

Question is how do I get longer word suggests returned when only typing
two letters?

I have set the following options for my term argument:

'min_word_len' => 2,
'size' => $size,
'sort' => 'frequency',
'prefix_len' => 2,
'field' => 'title'

Here are my results.

text of "yo" results:


text of "you" results:


text of "youn" results:


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