Remove searchSegmentOrderReversed from IndexSettings (#8808)

This property is unused now and can be safely removed.

Signed-off-by: Andrew Ross <andrross@amazon.com>

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

@@ -680,7 +680,6 @@ private void setRetentionLeaseMillis(final TimeValue retentionLease) {
     private volatile long mappingTotalFieldsLimit;
     private volatile long mappingDepthLimit;
     private volatile long mappingFieldNameLengthLimit;
-    private volatile boolean searchSegmentOrderReversed;
 
     /**
      * The maximum number of refresh listeners allows on this shard.
@@ -921,10 +920,6 @@ public IndexSettings(final IndexMetadata indexMetadata, final Settings nodeSetti
         );
     }
 
-    private void setSearchSegmentOrderReversed(boolean reversed) {
-        this.searchSegmentOrderReversed = reversed;
-    }
-
     private void setSearchIdleAfter(TimeValue searchIdleAfter) {
         if (this.replicationType == ReplicationType.SEGMENT && this.getNumberOfReplicas() > 0) {
             logger.warn("Search idle is not supported for indices with replicas using 'replication.type: SEGMENT'");
@@ -1109,13 +1104,6 @@ public Settings getNodeSettings() {
         return nodeSettings;
     }
 
-    /**
-     * Returns true if index level setting for leaf reverse order search optimization is enabled
-     */
-    public boolean getSearchSegmentOrderReversed() {
-        return this.searchSegmentOrderReversed;
-    }
-
     /**
      * Updates the settings and index metadata and notifies all registered settings consumers with the new settings iff at least one
      * setting has changed.