Fix version compat in CreateIndexRequest/UpdateSettingsRequest (#68736)

I forgot to update the serialisation version checks in `CreateIndexRequest`
and `UpdateSettingsRequest` after merging the backport #68375. Fix it.

server/src/main/java/org/elasticsearch/action/admin/indices/create/CreateIndexRequest.java

@@ -102,7 +102,7 @@ public class CreateIndexRequest extends AcknowledgedRequest<CreateIndexRequest>
             aliases.add(new Alias(in));
         }
         waitForActiveShards = ActiveShardCount.readFrom(in);
-        if (in.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (in.getVersion().onOrAfter(Version.V_7_12_0)) {
             origin = in.readString();
         }
     }
@@ -474,7 +474,7 @@ public class CreateIndexRequest extends AcknowledgedRequest<CreateIndexRequest>
             alias.writeTo(out);
         }
         waitForActiveShards.writeTo(out);
-        if (out.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (out.getVersion().onOrAfter(Version.V_7_12_0)) {
             out.writeString(origin);
         }
     }

server/src/main/java/org/elasticsearch/action/admin/indices/settings/put/UpdateSettingsRequest.java

@@ -51,7 +51,7 @@ public class UpdateSettingsRequest extends AcknowledgedRequest<UpdateSettingsReq
         indicesOptions = IndicesOptions.readIndicesOptions(in);
         settings = readSettingsFromStream(in);
         preserveExisting = in.readBoolean();
-        if (in.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (in.getVersion().onOrAfter(Version.V_7_12_0)) {
             origin = in.readString();
         }
     }
@@ -181,7 +181,7 @@ public class UpdateSettingsRequest extends AcknowledgedRequest<UpdateSettingsReq
         indicesOptions.writeIndicesOptions(out);
         writeSettingsToStream(settings, out);
         out.writeBoolean(preserveExisting);
-        if (out.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (out.getVersion().onOrAfter(Version.V_7_12_0)) {
             out.writeString(origin);
         }
     }