java.lang.IllegalArgumentException while getting RestHighLevelClient

[sunnybatabyal]

Below is my setup method

@Before
    public void setUp() {
        HttpHost host = new HttpHost("127.0.0.1", 9200);
        RestClientBuilder restClientBuilder = RestClient.builder(host);
        hClient = new RestHighLevelClient(restClientBuilder);
        lClient = hClient.getLowLevelClient();
    }

Which is giving me below error in line new RestHighLevelClient(restClientBuilder);

java.lang.IllegalArgumentException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.github.smitajit.elasticsearch.rest.mock.util.Utils.getProxiedClient(Utils.java:77)
	at org.elasticsearch.client.RestClientBuilder.build(RestClientBuilder.java)
	at org.elasticsearch.client.RestHighLevelClient.<init>(RestHighLevelClient.java:301)
	at org.elasticsearch.client.RestHighLevelClient.<init>(RestHighLevelClient.java:293)
	at search.repository.SSMockRunnerTest.setUp(SSMockRunnerTest.java:30)

[sunnybatabyal]

The above error is with ES REST Client 7.17 but the codebase is using ES rest client 6.2.3 which caused the error. Needs dependency update.