ngram "suggest" field for users, tracks, playlists

[stereosteve]

Users, tracks, playlists all get a suggest field which is analyzed with 2gram + 3gram analyzer. So searching infix will find some_infix_handle.

Also uses a minimum should match of 80% on the ngram field AND enables fuzzy AUTO... so we have fuzzy ngrams. So searching monoist will surface monist

This increases recall a fair bit, so almost all queries will likely have results.

If results are verging on "irrelevant" (i.e. precision of top 10 results is bad) there are a few options:

• increase the minimum_should_match to 90%
• increase boost of specific fields like title^20
• add more should query terms with higher boost
• adjust or remove the fuzzy setting