cherry-pick fix(query): fixing shard level failover for clustering V2

[kvpetrov]

Pull Request checklist

• [ X ] The commit(s) message(s) follows the contribution guidelines ?
• [ ] Tests for the changes have been added (for bug fixes / features) ?
• [ ] Docs have been added / updated (for bug fixes / features) ?

Current behavior : NullPointerException is thrown if shard is unassigned

New behavior : Exception is not thrown

BREAKING CHANGES

Other information: