[CI] OldRepositoryAccessIT testOldRepoAccess failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #6990 / amazonlinux-2023_platform-support-aws
• elasticsearch-pull-request #62353 / part-2
• elasticsearch-periodic-platform-support #6971 / ubuntu-2004_platform-support-unix

Reproduction Line:

./gradlew ":x-pack:qa:repository-old-versions:javaRestTestAfterRestart#6_8_20" --tests "org.elasticsearch.oldrepos.OldRepositoryAccessIT.testOldRepoAccess" -Dtests.seed=F3EAC8F3D8175C26 -Dtests.locale=en-SD -Dtests.timezone=Asia/Jerusalem -Druntime.java=24

Applicable branches: 8.18

Reproduces locally?: N/A

Failure History: See dashboard

Failure Message:

java.lang.AssertionError: timed out waiting for green state for index [restored_test_index] cluster state [{
  "cluster_name" : "6-8-20",
  "cluster_uuid" : "Y2txDfOOQfiREwCQr0A_eA",
  "version" : 217,
  "state_uuid" : "0Gf9T97eTuC14wgsElLBfw",
  "master_node" : "5y_MDEpVQB2tumoVU4mlKQ",
  "blocks" : {
    "indices" : {
      "custom" : {
        "8" : {
          "description" : "index write (api)",
          "retryable" : false,
          "levels" : [
            "write"
          ]
        }
      },
      "mounted_full_copy_test_index" : {
        "8" : {
          "description" : "index write (api)",
          "retryable" : false,
          "levels" : [
            "write"
          ]
        }
      },
      "nested" : {
        "8" : {
          "description" : "index write (api)",
          "retryable" : false,
          "levels" : [
            "write"
          ]
        }
      },
      "mounted_shared_cache_test_index" : {
        "8" : {
          "description" : "index wr
[truncated]

Issue Reasons:

• [8.18] 3 failures in test testOldRepoAccess (0.3% fail rate in 1000 executions)
• [8.18] 2 failures in pipeline elasticsearch-periodic-platform-support (40.0% fail rate in 5 executions)

Note: This issue was created using new test triage automation. Please report issues or feedback to es-delivery.