This commits adds a new end point for closing in-flight cursors, it also ensures that all cursors are properly closed by adding after test checks that ensures that we don't leave any search context open.
relates elastic/x-pack-elasticsearch#2878
Original commit: elastic/x-pack-elasticsearch@1052ea28dc
The keywords inside SqlBase are now sorted alphabetically - much easier
to read and update the docs
Original commit: elastic/x-pack-elasticsearch@5aa89c5950