Remove LegacyESVersion.V_6_4_x constants

[adnapibar]

Description

This PR removes LegacyESVersion.V_6_4_x constants.

Issues Resolved

Part of the meta issue #1674

Check List

• All tests pass
• Commits are signed per the DCO using --signoff

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Signed-off-by: Rabi Panda adnapibar@gmail.com

[opensearch-ci-bot]

Can one of the admins verify this patch?

[opensearch-ci-bot]

✅   Gradle Check success 8cb36d9c0ce232dc65b58b09b8636a019e0c59ab
Log 1619

Reports 1619

[opensearch-ci-bot]

❌   Gradle Check failure 5104fcf7e60b1645f01d706d2355c53f89edfc8e
Log 1631

Reports 1631

[adnapibar]

Unrelated & un-reproducible failure

REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.indices.stats.IndexStatsIT.testFilterCacheStats" -Dtests.seed=80C55F59F84BA870 -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=ar-MA -Dtests.timezone=US/Pacific -Druntime.java=17

org.opensearch.indices.stats.IndexStatsIT > testFilterCacheStats FAILED
    java.lang.AssertionError: shard [index][1] on node [node_s0] has pending operations:
     --> RetentionLeaseBackgroundSyncAction.Request{retentionLeases=RetentionLeases{primaryTerm=1, version=397, leases={peer_recovery/yxVn6WJyS-aXPxJftRrXqQ=RetentionLease{id='peer_recovery/yxVn6WJyS-aXPxJftRrXqQ', retainingSequenceNumber=2, timestamp=1640208027646, source='peer recovery'}}}, shardId=[index][1], timeout=1m, index='index', waitForActiveShards=0}
    	at org.opensearch.index.shard.IndexShardOperationPermits.acquire(IndexShardOperationPermits.java:248)
    	at org.opensearch.index.shard.IndexShard.acquirePrimaryOperationPermit(IndexShard.java:3231)
    	at org.opensearch.action.support.replication.TransportReplicationAction.acquirePrimaryOperationPermit(TransportReplicationAction.java:1117)
    	at org.opensearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.doRun(TransportReplicationAction.java:434)
    	at org.opensearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:50)
    	at org.opensearch.action.support.replication.TransportReplicationAction.handlePrimaryRequest(TransportReplicationAction.java:378)
    	at org.opensearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:98)
    	at org.opensearch.transport.TransportService$8.doRun(TransportService.java:944)
    	at org.opensearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:792)
    	at org.opensearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:50)
    	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
    	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)

[adnapibar]

start gradle check

[opensearch-ci-bot]

❌   Gradle Check failure 5104fcf7e60b1645f01d706d2355c53f89edfc8e
Log 1632

Reports 1632

[adnapibar]

More flakiness

REPRODUCE WITH: ./gradlew ':qa:remote-clusters:integTest' --tests "org.opensearch.cluster.remote.test.RemoteClustersIT.testHAProxyModeConnectionWorks" -Dtests.seed=2D4D59BC490DD2BB -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=sr-CS -Dtests.timezone=Etc/GMT+8 -Druntime.java=17

org.opensearch.cluster.remote.test.RemoteClustersIT > testHAProxyModeConnectionWorks FAILED
    java.lang.AssertionError
        at __randomizedtesting.SeedInfo.seed([2D4D59BC490DD2BB:2A3B8C77728BA4E6]:0)
        at org.junit.Assert.fail(Assert.java:86)
        at org.junit.Assert.assertTrue(Assert.java:41)
        at org.junit.Assert.assertTrue(Assert.java:52)
        at org.opensearch.cluster.remote.test.RemoteClustersIT.testHAProxyModeConnectionWorks(RemoteClustersIT.java:125)

[adnapibar]

start gradle check

[opensearch-ci-bot]

❌   Gradle Check failure 5104fcf7e60b1645f01d706d2355c53f89edfc8e
Log 1634

Reports 1634

[opensearch-ci-bot]

❌   Gradle Check failure 743b657ce3b9ad891a4a18b2769b4a16f889199d
Log 1637

Reports 1637

[adnapibar]

* What went wrong:
Execution failed for task ':distribution:bwc:bugfix:buildBwcLinuxTar'.
> Building 1.2.3 didn't generate expected file /var/CITOOL/workflow/OpenSearch_CI/PR_Checks/Gradle_Check/search/distribution/bwc/bugfix/build/bwc/checkout-1.2/distribution/archives/linux-tar/build/distributions/opensearch-min-1.2.3-SNAPSHOT-linux-x64.tar.gz

[opensearch-ci-bot]

✅   Gradle Check success 3189f09
Log 1652

Reports 1652