[ML] Fix logic for moving .ml-state-write alias from legacy to new #69280
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When multiple jobs start up together on a node following an upgrade, each one of them will trigger a check that the .ml-state* indices are as expected and the .ml-state-write alias points to the correct index. There were a couple of flaws in the logic: 1. We were not considering the possibility that one or more existing .ml-state* indices might be hidden. 2. If multiple jobs tried to create a .ml-state-000001 index simultaneously all but the first would fail. We accounted for this, but then did not follow up with the correct alias update request for those index creation requests that failed. This could cause all but one of the jobs starting up on the node to spuriously fail. Both these problems are fixed by this PR. Backport of elastic#69039
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When multiple jobs start up together on a node following
an upgrade, each one of them will trigger a check that the
.ml-state* indices are as expected and the .ml-state-write
alias points to the correct index.
There were a couple of flaws in the logic:
existing .ml-state* indices might be hidden.
simultaneously all but the first would fail. We accounted
for this, but then did not follow up with the correct alias
update request for those index creation requests that
failed. This could cause all but one of the jobs starting
up on the node to spuriously fail.
Both these problems are fixed by this PR.
Backport of #69039