Backporting 114084 to 8.x branch (#114106)

server/src/internalClusterTest/java/org/elasticsearch/search/retriever/RankDocRetrieverBuilderIT.java

@@ -53,6 +53,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
+import static org.elasticsearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_REPLICAS;
 import static org.elasticsearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_SHARDS;
 import static org.hamcrest.Matchers.equalTo;
 
@@ -112,7 +113,7 @@ public class RankDocRetrieverBuilderIT extends ESIntegTestCase {
               }
             }
             """;
-        createIndex(INDEX, Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 1).build());
+        createIndex(INDEX, Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 1).put(SETTING_NUMBER_OF_REPLICAS, 0).build());
         admin().indices().preparePutMapping(INDEX).setSource(mapping, XContentType.JSON).get();
         indexDoc(
             INDEX,

x-pack/plugin/rank-rrf/src/internalClusterTest/java/org/elasticsearch/xpack/rank/rrf/RRFRetrieverBuilderIT.java

@@ -33,6 +33,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
+import static org.elasticsearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_REPLICAS;
 import static org.elasticsearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_SHARDS;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
@@ -97,7 +98,7 @@ public class RRFRetrieverBuilderIT extends ESIntegTestCase {
               }
             }
             """;
-        createIndex(INDEX, Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 5).build());
+        createIndex(INDEX, Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 1).put(SETTING_NUMBER_OF_REPLICAS, 0).build());
         admin().indices().preparePutMapping(INDEX).setSource(mapping, XContentType.JSON).get();
         indexDoc(INDEX, "doc_1", DOC_FIELD, "doc_1", TOPIC_FIELD, "technology", TEXT_FIELD, "term");
         indexDoc(
@@ -301,7 +302,7 @@ public class RRFRetrieverBuilderIT extends ESIntegTestCase {
         });
     }
 
-    public void testRankDocsRetrieverWithCollapseAndAggs() {
+    public void testRRFRetrieverWithCollapseAndAggs() {
         final int rankWindowSize = 100;
         final int rankConstant = 10;
         SearchSourceBuilder source = new SearchSourceBuilder();

x-pack/plugin/rank-rrf/src/internalClusterTest/java/org/elasticsearch/xpack/rank/rrf/RRFRetrieverBuilderNestedDocsIT.java

@@ -21,6 +21,7 @@ import org.elasticsearch.xcontent.XContentType;
 
 import java.util.Arrays;
 
+import static org.elasticsearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_REPLICAS;
 import static org.elasticsearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_SHARDS;
 import static org.hamcrest.Matchers.equalTo;
 
@@ -67,7 +68,7 @@ public class RRFRetrieverBuilderNestedDocsIT extends RRFRetrieverBuilderIT {
               }
             }
             """;
-        createIndex(INDEX, Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 5).build());
+        createIndex(INDEX, Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 1).put(SETTING_NUMBER_OF_REPLICAS, 0).build());
         admin().indices().preparePutMapping(INDEX).setSource(mapping, XContentType.JSON).get();
         indexDoc(INDEX, "doc_1", DOC_FIELD, "doc_1", TOPIC_FIELD, "technology", TEXT_FIELD, "term", LAST_30D_FIELD, 100);
         indexDoc(