./gradlew ":qa:rolling-upgrade:v9.3.1#bwcTest" -Dtests.class="org.elasticsearch.upgrades.TSDBSyntheticIdUpgradeIT" -Dtests.method="testRollingUpgrade {upgradedNodes=2}" -Dtests.seed=763E9AFA1FFBCB90 -Dtests.bwc=true -Dtests.locale=ar-EG -Dtests.timezone=America/Argentina/Mendoza -Druntime.java=21

java.lang.AssertionError: 
Expected: (a string containing "unknown setting [index.mapping.synthetic_id]" or a string containing "The setting [index.mapping.synthetic_id] is only permitted for indexVersion [9071000] or later. Current indexVersion: [9060000].")
     but: was "method [PUT], host [http://[::1]:43123], URI [/mixed-cluster-index], status line [HTTP/1.1 400 Bad Request]\n---\nerror:\n  root_cause:\n  - type: \"illegal_argument_exception\"\n    reason: \"The setting [index.mapping.synthetic_id] is only permitted for indexVersion\\\n      \\ [9071000] or later. Current indexVersion: [9060000].\"\n  type: \"illegal_argument_exception\"\n  reason: \"The setting [index.mapping.synthetic_id] is only permitted for indexVersion\\\n    \\ [9071000] or later. Current indexVersion: [9060000].\"\nstatus: 400\n"