Adjust soft-deletes version after backport into 6.5

Relates #33222

Author: dnhatn

server/src/main/java/org/elasticsearch/index/IndexSettings.java

@@ -416,7 +416,7 @@ public IndexSettings(final IndexMetaData indexMetaData, final Settings nodeSetti
         generationThresholdSize = scopedSettings.get(INDEX_TRANSLOG_GENERATION_THRESHOLD_SIZE_SETTING);
         mergeSchedulerConfig = new MergeSchedulerConfig(this);
         gcDeletesInMillis = scopedSettings.get(INDEX_GC_DELETES_SETTING).getMillis();
-        softDeleteEnabled = version.onOrAfter(Version.V_7_0_0_alpha1) && scopedSettings.get(INDEX_SOFT_DELETES_SETTING);
+        softDeleteEnabled = version.onOrAfter(Version.V_6_5_0) && scopedSettings.get(INDEX_SOFT_DELETES_SETTING);
         softDeleteRetentionOperations = scopedSettings.get(INDEX_SOFT_DELETES_RETENTION_OPERATIONS_SETTING);
         warmerEnabled = scopedSettings.get(INDEX_WARMER_ENABLED_SETTING);
         maxResultWindow = scopedSettings.get(MAX_RESULT_WINDOW_SETTING);