preserve enum ordering in RecoverySource.Type

[parasjain1]

Description

The test org.opensearch.cluster.routing.RecoverySourceTests#testRecoverySourceTypeOrder was breaking earlier.

java.lang.AssertionError: 
Expected :6
Actual   :5
<Click to see difference>


	at __randomizedtesting.SeedInfo.seed([EF83502050A8577B:2E219DDC7BA88C42]:0)
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.failNotEquals(Assert.java:835)
	at org.junit.Assert.assertEquals(Assert.java:647)
	at org.junit.Assert.assertEquals(Assert.java:633)
	at org.opensearch.cluster.routing.RecoverySourceTests.testRecoverySourceTypeOrder(RecoverySourceTests.java:87)

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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