Fix restart bwc

[finnegancarroll]

Description

Full restart bwc only restarts single node.

Related Issues

N/A

Check List

• [x] New functionality includes testing.
• [x] New functionality has been documented.
• [x] API changes companion pull request created.
• [x] Commits are signed per the DCO using --signoff.
• [x] Public documentation issue/PR created.

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[mch2]

@finnegancarroll is this still required since the version bump?

[finnegancarroll]

Yea this is a fix for the full cluster restart bwc. Behavior should be all nodes restart but currently only one is upgraded. Introduced back here: https://github.com/opensearch-project/asynchronous-search/pull/575/files#diff-49a96e7eea8a94af862798a45174e6ac43eb4f8b4bd40759b5da63ba31ec3ef7L396