ES|QL: Add multi-node Spec tests (elastic#98849)

x-pack/plugin/esql/qa/server/multi-node/build.gradle

@@ -0,0 +1,19 @@
+apply plugin: 'elasticsearch.legacy-yaml-rest-test'
+
+dependencies {
+  javaRestTestImplementation project(xpackModule('esql:qa:testFixtures'))
+}
+
+restResources {
+  restApi {
+    include '_common', 'bulk', 'indices', 'esql', 'xpack', 'enrich'
+  }
+}
+
+testClusters.configureEach {
+  numberOfNodes = 2
+  testDistribution = 'DEFAULT'
+  setting 'xpack.license.self_generated.type', 'trial'
+  setting 'xpack.monitoring.collection.enabled', 'true'
+  setting 'xpack.security.enabled', 'false'
+}

x-pack/plugin/esql/qa/server/multi-node/src/javaRestTest/java/org/elasticsearch/xpack/esql/qa/multi_node/EsqlSpecIT.java

@@ -0,0 +1,17 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.esql.qa.multi_node;
+
+import org.elasticsearch.xpack.esql.qa.rest.EsqlSpecTestCase;
+import org.elasticsearch.xpack.ql.CsvSpecReader.CsvTestCase;
+
+public class EsqlSpecIT extends EsqlSpecTestCase {
+    public EsqlSpecIT(String fileName, String groupName, String testName, Integer lineNumber, CsvTestCase testCase) {
+        super(fileName, groupName, testName, lineNumber, testCase);
+    }
+}