xpack.migration.upgrade | Elasticsearch Node.js client [6.x]

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xpack.migration.upgradeedit

client.xpack.migration.upgrade({
  index: string,
  wait_for_completion: boolean
})

`index`	`string` - The name of the index
`wait_for_completion` or `waitForCompletion`	`boolean` - Should the request block until the upgrade operation is completed Default: `true`