Rename feature flag to gpu_vectors_indexing

Author: mayya-sharipova

docs/changelog/135545.yaml

@@ -1,5 +1,5 @@
 pr: 135545
-summary: Add GPUPlugin for vector indeces on GPU
+summary: Add GPUPlugin for indexing vectors on GPU
 area: Vector Search
 type: feature
 issues: []

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

@@ -65,7 +65,6 @@
  * be called for each settings update.
  */
 public final class IndexSettings {
-
     public static final Setting<List<String>> DEFAULT_FIELD_SETTING = Setting.stringListSetting(
         "index.query.default_field",
         Collections.singletonList("*"),

x-pack/plugin/gpu/src/main/java/org/elasticsearch/xpack/gpu/GPUPlugin.java

@@ -21,7 +21,7 @@
 
 public class GPUPlugin extends Plugin implements InternalVectorFormatProviderPlugin {
 
-    public static final FeatureFlag GPU_FORMAT = new FeatureFlag("gpu_format");
+    public static final FeatureFlag GPU_FORMAT = new FeatureFlag("gpu_vectors_indexing");
 
     /**
      * An enum for the tri-state value of the `index.vectors.indexing.use_gpu` setting.