ES|QL: Add multi-node generative tests

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

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+/*
+ * 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 com.carrotsearch.randomizedtesting.annotations.ThreadLeakFilters;
+
+import org.elasticsearch.test.TestClustersThreadFilter;
+import org.elasticsearch.test.cluster.ElasticsearchCluster;
+import org.elasticsearch.xpack.esql.qa.rest.generative.GenerativeRestTest;
+import org.junit.ClassRule;
+
+/**
+ * This test generates random queries, runs them against the CSV test dataset and checks that they don't throw unexpected exceptions.
+ *
+ * If muted, please:
+ * <ul>
+ * <li>see the error message reported in the failure and the corresponding query (it's in the logs right before the error)</li>
+ * <li>update the corresponding issue with the query (if there is no issue for that failure yet, create one)</li>
+ * <li>add a pattern that matches the error message to {@link GenerativeRestTest#ALLOWED_ERRORS}; also link the issue</li>
+ * <li>unmute (and possibly check that the test doesn't fail anymore)</li>
+ * </ul>
+ */
+@ThreadLeakFilters(filters = TestClustersThreadFilter.class)
+public class GenerativeIT extends GenerativeRestTest {
+    @ClassRule
+    public static ElasticsearchCluster cluster = Clusters.testCluster(spec -> spec.plugin("inference-service-test"));
+
+    @Override
+    protected String getTestRestCluster() {
+        return cluster.getHttpAddresses();
+    }
+
+    @Override
+    protected boolean supportsSourceFieldMapping() {
+        return false;
+    }
+}