Tests: Fix more bad assumptions about routing in TransportTwoNodesSearchTests.
Revert "Tests: Temporarily ignore RoutingBackwardCompatibilityUponUpgradeTests."

This reverts commit 181bd6e56a2e6cfa1e0e85a5a7778cae5a8e62e1.
Test: make field `id` is defined in mapping, so sort can't fail
[TEST] Remove redundant call to setTemplateType()
Docs: Updated ES/JVM versions
Update the status of the shard info header work.
Docs: updated resiliency page for 1.4.0
Docs: minor update to resiliency page
Add Version constants for 1.3.6 and 1.4.1