[kbn/test] switch to @elastic/elasticsearch (#95443) (#95468)

Co-authored-by: spalger <spalger@users.noreply.github.com>

Co-authored-by: Spencer <email@spalger.com>
Co-authored-by: spalger <spalger@users.noreply.github.com>

packages/kbn-test/src/legacy_es/legacy_es_test_cluster.js

@@ -12,9 +12,9 @@ import { get, toPath } from 'lodash';
 import { Cluster } from '@kbn/es';
 import { CI_PARALLEL_PROCESS_PREFIX } from '../ci_parallel_process_prefix';
 import { esTestConfig } from './es_test_config';
+import { Client } from '@elastic/elasticsearch';
 
 import { KIBANA_ROOT } from '../';
-import * as legacyElasticsearch from 'elasticsearch';
 const path = require('path');
 const del = require('del');
 
@@ -103,8 +103,8 @@ export function createLegacyEsTestCluster(options = {}) {
      * Returns an ES Client to the configured cluster
      */
     getClient() {
-      return new legacyElasticsearch.Client({
-        host: this.getUrl(),
+      return new Client({
+        node: this.getUrl(),
       });
     }