[release-2.9.x] Series Index Store: fix race in GetSeries #10346
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Backport cf353bb from #10310
What this PR does / why we need it:
Lock around data that is modified from multiple goroutines concurrently.Replaced with the implementation from #9984 since @akhilanarayanan did it more efficiently.
Which issue(s) this PR fixes:
Relates to #8586
Checklist
CONTRIBUTING.mdguide (required)CHANGELOG.mdupdatedadd-to-release-noteslabeldocs/sources/setup/upgrade/_index.mdproduction/helm/loki/Chart.yamland updateproduction/helm/loki/CHANGELOG.mdandproduction/helm/loki/README.md. Example PR