Fix: Add NamedWriteable for RuleQueryRankDoc (#128153) (#128268)

* Add NamedWriteable for QueryRule rank doc

* Update test

* Update docs/changelog/128153.yaml

* Add multi cluster test for query rules

* Commenting out code - explicitly trying to spur a test failure

* [CI] Auto commit changes from spotless

* Streamline test for multi cluster

* Revert changes to try to break test

* Fix compile error

---------

Co-authored-by: elasticsearchmachine <[email protected]>
(cherry picked from commit b335c1a)

# Conflicts:
#	x-pack/plugin/ent-search/qa/rest/src/yamlRestTest/resources/rest-api-spec/test/entsearch/rules/40_rule_query_search.yml

Author: kderusso

docs/changelog/128153.yaml

@@ -0,0 +1,6 @@
+pr: 128153
+summary: "Fix: Add `NamedWriteable` for `RuleQueryRankDoc`"
+area: Relevance
+type: bug
+issues:
+ - 126071

x-pack/plugin/ent-search/src/main/java/org/elasticsearch/xpack/application/EnterpriseSearch.java

@@ -30,6 +30,7 @@
 import org.elasticsearch.plugins.SystemIndexPlugin;
 import org.elasticsearch.rest.RestController;
 import org.elasticsearch.rest.RestHandler;
+import org.elasticsearch.search.rank.RankDoc;
 import org.elasticsearch.xcontent.ParseField;
 import org.elasticsearch.xpack.application.analytics.AnalyticsTemplateRegistry;
 import org.elasticsearch.xpack.application.analytics.action.DeleteAnalyticsCollectionAction;
@@ -179,6 +180,7 @@
 import org.elasticsearch.xpack.application.rules.action.TransportPutQueryRulesetAction;
 import org.elasticsearch.xpack.application.rules.action.TransportTestQueryRulesetAction;
 import org.elasticsearch.xpack.application.rules.retriever.QueryRuleRetrieverBuilder;
+import org.elasticsearch.xpack.application.rules.retriever.RuleQueryRankDoc;
 import org.elasticsearch.xpack.application.search.SearchApplicationIndexService;
 import org.elasticsearch.xpack.application.search.action.DeleteSearchApplicationAction;
 import org.elasticsearch.xpack.application.search.action.GetSearchApplicationAction;
@@ -347,6 +349,11 @@ protected XPackLicenseState getLicenseState() {
         return Collections.unmodifiableList(actionHandlers);
     }
 
+    @Override
+    public List<NamedWriteableRegistry.Entry> getNamedWriteables() {
+        return List.of(new NamedWriteableRegistry.Entry(RankDoc.class, RuleQueryRankDoc.NAME, RuleQueryRankDoc::new));
+    }
+
     @Override
     public List<RestHandler> getRestHandlers(
         Settings settings,