This is a hack to remove a dependency cycle I added in elastic/x-pack-elasticsearch#2109. I think
it'd be cleaner to remove the cycle by making sql its own plugin that
doesn't depend on the rest of x-pack-elasticsearch but is still
included within x-pack-elasticsearch. But that is a broader change.
Original commit: elastic/x-pack-elasticsearch@47b7d69d80
To avoid leaking client information across the entire code-base, client
settings like TimeZone or pagination are stored in
SqlSession>SqlSettings which are available as a ThreadLocal (during
analysis) so that components that need them, can pick them up.
Since ES internally uses Joda, the date/time functionality relies on Joda,
whenever possible to match the behavior.
Original commit: elastic/x-pack-elasticsearch@20f41e2bb3
Nik Everett
Costin Leau