Improve word_count calculation for CJK posts, or use char count

[sam (Sam Saffron)]

Hmm, if we are smart about our pipeline we could use cppjieba.

lib/search.rb

It would require that update_index! would take care of this:

app/services/search_indexer.rb

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char count is probably the simplest thing though, given that reading the word bla is far faster than reading supercalifragilisticexpialidocious

I wonder if you can make some PR that changes so we lean on char count, then we can divide char count by 4 say for English and 2 for Chinese? (via some setting)

@lindsey this is an interesting topic for you.