Add search index (and endpoint) for version content

[Mr0grog]

Listening to analyst discussions, sometimes there are particular terms or changes that it would be really helpful to search for other instances of (e.g. “state cooperation”). It would be great for our API to support searching a textual index of the content of each version (doubly awesome if we could have an index of changed text in each version).

We can use existing differs/diff routines to extract that content, but then we need something to compile, store, and search an index based on that. And of course an API design for how to use it :)

[stale]

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