As per #471 ->
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I'm using search-index@0.15.1 with levelup and redis as a db.
I'm not using leveldown/levelDB so I don't want to install it (plus, it doesn't build on the specific node-alpine version I am targeting), that's why I am installing search-index with the --no-optional option.
The problem is, despite leveldown being marked as optional, it's required at the top of the search-index/index.js, so when I start my app it immediately crashes, complaining about leveldown not being resolvable.
The fix is easy: move the require down, so that it's only executed when necessary.
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