fix: restore previous feature name

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

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_default" ]
-      reason: requires synthetic recovery source by default
+      cluster_features: [ "mapper.synthetic_recovery_source" ]
+      reason: requires synthetic recovery source
 
   - do:
       indices.create:
@@ -88,8 +88,8 @@ synthetic recovery for standard index:
 ---
 synthetic recovery for logsdb index:
   - requires:
-      cluster_features: [ "index.recovery.synthetic_source_default" ]
-      reason: requires synthetic recovery source by default
+      cluster_features: [ "mapper.synthetic_recovery_source" ]
+      reason: requires synthetic recovery source
 
   - 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_default" ]
-      reason: requires synthetic recovery source by default
+      cluster_features: [ "mapper.synthetic_recovery_source" ]
+      reason: requires synthetic recovery source
 
   - do:
       indices.create: