Delete by query

[ElPicador]

You can delete all objects matching a single query with the following code. Internally, the API client performs the query, deletes all matching hits, and waits until the deletions have been applied.

TODO: Query query = /* [ ... ] */;
index.deleteByQuery(query);

[ElPicador]

Postponed to 1.5, after implementing queries

[ElPicador]

This needs #15, so postponing it to 1.6

[ElPicador]

See #15 for why we won't do it unless someone asks for it 😄