Remove stale comment about setting routing before parent

Order does not matter anymore since we merged #15371

core/src/main/java/org/elasticsearch/action/bulk/BulkRequest.java

@@ -432,7 +432,6 @@ public class BulkRequest extends ActionRequest implements CompositeIndicesReques
                     }
                     line++;
 
-                    // order is important, we set parent after routing, so routing will be set to parent if not set explicitly
                     // we use internalAdd so we don't fork here, this allows us not to copy over the big byte array to small chunks
                     // of index request.
                     if ("index".equals(action)) {

core/src/main/java/org/elasticsearch/rest/action/document/RestDeleteAction.java

@@ -44,7 +44,7 @@ public class RestDeleteAction extends BaseRestHandler {
     public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
         DeleteRequest deleteRequest = new DeleteRequest(request.param("index"), request.param("type"), request.param("id"));
         deleteRequest.routing(request.param("routing"));
-        deleteRequest.parent(request.param("parent")); // order is important, set it after routing, so it will set the routing
+        deleteRequest.parent(request.param("parent"));
         deleteRequest.timeout(request.paramAsTime("timeout", DeleteRequest.DEFAULT_TIMEOUT));
         deleteRequest.setRefreshPolicy(request.param("refresh"));
         deleteRequest.version(RestActions.parseVersion(request));

core/src/main/java/org/elasticsearch/rest/action/document/RestGetAction.java

@@ -53,7 +53,7 @@ public class RestGetAction extends BaseRestHandler {
         final GetRequest getRequest = new GetRequest(request.param("index"), request.param("type"), request.param("id"));
         getRequest.operationThreaded(true);
         getRequest.refresh(request.paramAsBoolean("refresh", getRequest.refresh()));
-        getRequest.routing(request.param("routing"));  // order is important, set it after routing, so it will set the routing
+        getRequest.routing(request.param("routing"));
         getRequest.parent(request.param("parent"));
         getRequest.preference(request.param("preference"));
         getRequest.realtime(request.paramAsBoolean("realtime", getRequest.realtime()));

core/src/main/java/org/elasticsearch/rest/action/document/RestIndexAction.java

@@ -62,7 +62,7 @@ public class RestIndexAction extends BaseRestHandler {
     public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
         IndexRequest indexRequest = new IndexRequest(request.param("index"), request.param("type"), request.param("id"));
         indexRequest.routing(request.param("routing"));
-        indexRequest.parent(request.param("parent")); // order is important, set it after routing, so it will set the routing
+        indexRequest.parent(request.param("parent"));
         indexRequest.setPipeline(request.param("pipeline"));
         indexRequest.source(request.content(), request.getXContentType());
         indexRequest.timeout(request.paramAsTime("timeout", IndexRequest.DEFAULT_TIMEOUT));

core/src/main/java/org/elasticsearch/rest/action/document/RestUpdateAction.java

@@ -83,7 +83,7 @@ public class RestUpdateAction extends BaseRestHandler {
             IndexRequest upsertRequest = updateRequest.upsertRequest();
             if (upsertRequest != null) {
                 upsertRequest.routing(request.param("routing"));
-                upsertRequest.parent(request.param("parent")); // order is important, set it after routing, so it will set the routing
+                upsertRequest.parent(request.param("parent"));
                 upsertRequest.version(RestActions.parseVersion(request));
                 upsertRequest.versionType(VersionType.fromString(request.param("version_type"), upsertRequest.versionType()));
             }