Remove unused segment replication feature flag (opensearch-project#11850)

This feature has been released and the feature flag is no longer used.

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

Author: andrross

server/src/main/java/org/opensearch/common/settings/FeatureFlagSettings.java

@@ -11,9 +11,6 @@
 import org.opensearch.common.settings.Setting.Property;
 import org.opensearch.common.util.FeatureFlags;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashSet;
 import java.util.Set;
 
 /**
@@ -32,17 +29,12 @@ protected FeatureFlagSettings(
         super(settings, settingsSet, settingUpgraders, scope);
     }
 
-    public static final Set<Setting<?>> BUILT_IN_FEATURE_FLAGS = Collections.unmodifiableSet(
-        new HashSet<>(
-            Arrays.asList(
-                FeatureFlags.SEGMENT_REPLICATION_EXPERIMENTAL_SETTING,
-                FeatureFlags.EXTENSIONS_SETTING,
-                FeatureFlags.IDENTITY_SETTING,
-                FeatureFlags.CONCURRENT_SEGMENT_SEARCH_SETTING,
-                FeatureFlags.TELEMETRY_SETTING,
-                FeatureFlags.DATETIME_FORMATTER_CACHING_SETTING,
-                FeatureFlags.WRITEABLE_REMOTE_INDEX_SETTING
-            )
-        )
+    public static final Set<Setting<?>> BUILT_IN_FEATURE_FLAGS = Set.of(
+        FeatureFlags.EXTENSIONS_SETTING,
+        FeatureFlags.IDENTITY_SETTING,
+        FeatureFlags.CONCURRENT_SEGMENT_SEARCH_SETTING,
+        FeatureFlags.TELEMETRY_SETTING,
+        FeatureFlags.DATETIME_FORMATTER_CACHING_SETTING,
+        FeatureFlags.WRITEABLE_REMOTE_INDEX_SETTING
     );
 }

server/src/main/java/org/opensearch/common/util/FeatureFlags.java

@@ -20,12 +20,6 @@
  * @opensearch.internal
  */
 public class FeatureFlags {
-    /**
-     * Gates the visibility of the segment replication experimental features that allows users to test unreleased beta features.
-     */
-    public static final String SEGMENT_REPLICATION_EXPERIMENTAL =
-        "opensearch.experimental.feature.segment_replication_experimental.enabled";
-
     /**
      * Gates the ability for Searchable Snapshots to read snapshots that are older than the
      * guaranteed backward compatibility for OpenSearch (one prior major version) on a best effort basis.
@@ -105,12 +99,6 @@ public static boolean isEnabled(Setting<Boolean> featureFlag) {
         }
     }
 
-    public static final Setting<Boolean> SEGMENT_REPLICATION_EXPERIMENTAL_SETTING = Setting.boolSetting(
-        SEGMENT_REPLICATION_EXPERIMENTAL,
-        false,
-        Property.NodeScope
-    );
-
     public static final Setting<Boolean> EXTENSIONS_SETTING = Setting.boolSetting(EXTENSIONS, false, Property.NodeScope);
 
     public static final Setting<Boolean> IDENTITY_SETTING = Setting.boolSetting(IDENTITY, false, Property.NodeScope);