[ML] Removing unified feature flag

test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java

@@ -18,8 +18,7 @@
 public enum FeatureFlag {
     TIME_SERIES_MODE("es.index_mode_feature_flag_registered=true", Version.fromString("8.0.0"), null),
     FAILURE_STORE_ENABLED("es.failure_store_feature_flag_enabled=true", Version.fromString("8.12.0"), null),
-    SUB_OBJECTS_AUTO_ENABLED("es.sub_objects_auto_feature_flag_enabled=true", Version.fromString("8.16.0"), null),
-    INFERENCE_UNIFIED_API_ENABLED("es.inference_unified_feature_flag_enabled=true", Version.fromString("8.18.0"), null);
+    SUB_OBJECTS_AUTO_ENABLED("es.sub_objects_auto_feature_flag_enabled=true", Version.fromString("8.16.0"), null);
 
     public final String systemProperty;
     public final Version from;

x-pack/plugin/inference/qa/inference-service-tests/src/javaRestTest/java/org/elasticsearch/xpack/inference/BaseMockEISAuthServerTest.java

@@ -14,7 +14,6 @@
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.junit.ClassRule;
@@ -45,7 +44,6 @@ public class BaseMockEISAuthServerTest extends ESRestTestCase {
         // This plugin is located in the inference/qa/test-service-plugin package, look for TestInferenceServicePlugin
         .plugin("inference-service-test")
         .user("x_pack_rest_user", "x-pack-test-password")
-        .feature(FeatureFlag.INFERENCE_UNIFIED_API_ENABLED)
         .build();
 
     // The reason we're doing this is to make sure the mock server is initialized first so we can get the address before communicating

x-pack/plugin/inference/qa/inference-service-tests/src/javaRestTest/java/org/elasticsearch/xpack/inference/InferenceBaseRestTest.java

@@ -19,7 +19,6 @@
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.inference.TaskType;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -50,8 +49,8 @@ public class InferenceBaseRestTest extends ESRestTestCase {
         .setting("xpack.security.enabled", "true")
         .plugin("inference-service-test")
         .user("x_pack_rest_user", "x-pack-test-password")
-        .feature(FeatureFlag.INFERENCE_UNIFIED_API_ENABLED)
         .build();
+
     @ClassRule
     public static MlModelServer mlModelServer = new MlModelServer();
 

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferencePlugin.java

@@ -131,7 +131,6 @@
 import java.util.Map;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
-import java.util.stream.Stream;
 
 import static java.util.Collections.singletonList;
 import static org.elasticsearch.xpack.inference.services.elastic.ElasticInferenceService.ELASTIC_INFERENCE_SERVICE_IDENTIFIER;
@@ -193,24 +192,17 @@ public InferencePlugin(Settings settings) {
 
     @Override
     public List<ActionHandler<? extends ActionRequest, ? extends ActionResponse>> getActions() {
-        var availableActions = List.of(
+        return List.of(
             new ActionHandler<>(InferenceAction.INSTANCE, TransportInferenceAction.class),
-
             new ActionHandler<>(GetInferenceModelAction.INSTANCE, TransportGetInferenceModelAction.class),
             new ActionHandler<>(PutInferenceModelAction.INSTANCE, TransportPutInferenceModelAction.class),
             new ActionHandler<>(UpdateInferenceModelAction.INSTANCE, TransportUpdateInferenceModelAction.class),
             new ActionHandler<>(DeleteInferenceEndpointAction.INSTANCE, TransportDeleteInferenceEndpointAction.class),
             new ActionHandler<>(XPackUsageFeatureAction.INFERENCE, TransportInferenceUsageAction.class),
             new ActionHandler<>(GetInferenceDiagnosticsAction.INSTANCE, TransportGetInferenceDiagnosticsAction.class),
-            new ActionHandler<>(GetInferenceServicesAction.INSTANCE, TransportGetInferenceServicesAction.class)
+            new ActionHandler<>(GetInferenceServicesAction.INSTANCE, TransportGetInferenceServicesAction.class),
+            new ActionHandler<>(UnifiedCompletionAction.INSTANCE, TransportUnifiedCompletionInferenceAction.class)
         );
-
-        List<ActionHandler<? extends ActionRequest, ? extends ActionResponse>> conditionalActions =
-            UnifiedCompletionFeature.UNIFIED_COMPLETION_FEATURE_FLAG.isEnabled()
-                ? List.of(new ActionHandler<>(UnifiedCompletionAction.INSTANCE, TransportUnifiedCompletionInferenceAction.class))
-                : List.of();
-
-        return Stream.concat(availableActions.stream(), conditionalActions.stream()).toList();
     }
 
     @Override
@@ -225,21 +217,17 @@ public List<RestHandler> getRestHandlers(
         Supplier<DiscoveryNodes> nodesInCluster,
         Predicate<NodeFeature> clusterSupportsFeature
     ) {
-        var availableRestActions = List.of(
+        return List.of(
             new RestInferenceAction(),
             new RestStreamInferenceAction(threadPoolSetOnce),
             new RestGetInferenceModelAction(),
             new RestPutInferenceModelAction(),
             new RestUpdateInferenceModelAction(),
             new RestDeleteInferenceEndpointAction(),
             new RestGetInferenceDiagnosticsAction(),
-            new RestGetInferenceServicesAction()
+            new RestGetInferenceServicesAction(),
+            new RestUnifiedCompletionInferenceAction(threadPoolSetOnce)
         );
-        List<RestHandler> conditionalRestActions = UnifiedCompletionFeature.UNIFIED_COMPLETION_FEATURE_FLAG.isEnabled()
-            ? List.of(new RestUnifiedCompletionInferenceAction(threadPoolSetOnce))
-            : List.of();
-
-        return Stream.concat(availableRestActions.stream(), conditionalRestActions.stream()).toList();
     }
 
     @Override