OpenSearch/rest-api-spec/test/indices.upgrade/10_basic.yaml

---
"Basic test for upgrade indices":

  - do:
      indices.create:
        index: test_index
        body:
          settings:
            index:
              number_of_replicas: 0


  - do:
      cluster.health:
        wait_for_status: green

  - do:
      indices.upgrade:
        index: test_index

  - match: {upgraded_indices.test_index: '/(\d\.)+\d/'}