fix: use a better feature name and description

Author: salvatore-campagna

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/update/100_synthetic_source.yml

@@ -6,8 +6,8 @@ setup:
 ---
 keyword:
   - requires:
-      cluster_features: [ "index.recovery.synthetic_source" ]
-      reason: requires synthetic recovery source
+      cluster_features: [ "index.recovery.synthetic_source_default" ]
+      reason: requires synthetic recovery source by default
 
   - do:
       indices.create:
@@ -66,8 +66,8 @@ keyword:
 ---
 stored text:
   - requires:
-      cluster_features: [ "index.recovery.synthetic_source" ]
-      reason: requires synthetic recovery source
+      cluster_features: [ "index.recovery.synthetic_source_default" ]
+      reason: requires synthetic recovery source by default
 
   - do:
       indices.create:

server/src/main/java/org/elasticsearch/index/mapper/MapperFeatures.java

@@ -31,7 +31,9 @@ public class MapperFeatures implements FeatureSpecification {
     public static final NodeFeature SPARSE_VECTOR_STORE_SUPPORT = new NodeFeature("mapper.sparse_vector.store_support");
     public static final NodeFeature SORT_FIELDS_CHECK_FOR_NESTED_OBJECT_FIX = new NodeFeature("mapper.nested.sorting_fields_check_fix");
     public static final NodeFeature DYNAMIC_HANDLING_IN_COPY_TO = new NodeFeature("mapper.copy_to.dynamic_handling");
-    public static final NodeFeature SYNTHETIC_SOURCE_RECOVERY = new NodeFeature("index.recovery.synthetic_source");
+    public static final NodeFeature USE_SYNTHETIC_SOURCE_FOR_RECOVERY_BY_DEFAULT = new NodeFeature(
+        "index.recovery.synthetic_source_default"
+    );
 
     @Override
     public Set<NodeFeature> getTestFeatures() {

x-pack/plugin/logsdb/src/yamlRestTest/resources/rest-api-spec/test/60_synthetic_source_recovery.yml

@@ -1,8 +1,8 @@
 ---
 synthetic recovery for synthetic source mode index:
   - requires:
-      cluster_features: [ "index.recovery.synthetic_source" ]
-      reason: requires synthetic recovery source
+      cluster_features: [ "index.recovery.synthetic_source_default" ]
+      reason: requires synthetic recovery source by default
 
   - do:
       indices.create:
@@ -88,8 +88,8 @@ synthetic recovery for standard index:
 ---
 synthetic recovery for logsdb index:
   - requires:
-      cluster_features: [ "index.recovery.synthetic_source" ]
-      reason: requires synthetic recovery source
+      cluster_features: [ "index.recovery.synthetic_source_default" ]
+      reason: requires synthetic recovery source by default
 
   - do:
       indices.create:
@@ -109,8 +109,8 @@ synthetic recovery for logsdb index:
 ---
 synthetic recovery for time_series index:
   - requires:
-      cluster_features: [ "index.recovery.synthetic_source" ]
-      reason: requires synthetic recovery source
+      cluster_features: [ "index.recovery.synthetic_source_default" ]
+      reason: requires synthetic recovery source by default
 
   - do:
       indices.create: