This commit replaces the REST test that the global checkpoint sync
action runs successfully as a privileged user. The test needs to be
replaced because it has a small race condition. Namely, the check that
the post-operation global checkpoint sync was successful could run
before the sync finishes running. To address this, we replace the REST
test with a test where we have a little more control and can assert busy
to avoid this race from failing the test.
Relates elastic/x-pack-elasticsearch#2749
Original commit: elastic/x-pack-elasticsearch@ea585b843c
After a write operation on an index, a post-operation global checkpoint
sync fires. Previously, this action fired on the same user as executed
the write action. If the user did not have priviledges for this action,
the global checkpoint sync would fail. With an upstream change in core,
this action now fires as the system user. This commit adds a test that
create a user that has minimal write permissions on an index, but none
that would imply it could execute the global checkpoint sync. This then
serves as a test that the upstream change to fire the global checkpoint
sync as the system user is correct. This test must run as a mulit-node
test so that a replica is a assigned so that the global checkpoint sync
fires in the first place. This test does indeed fail without the
upstream change, and passes with it.
Relates elastic/x-pack-elasticsearch#2744
Original commit: elastic/x-pack-elasticsearch@bf7e771756
Jason Tedor